After hopping across three islands, one ferry and one tiny airplane ride later I made it to the island of St. Croix. Though still part of the US Virgin Island, St. Croix lies some 40 miles south of the cluster of Virgin Islands split between the US and Britain. Compared to the sparse population on St. John, St. Croix is a relatively industrial center for the USVI, though it is still home to both cultural and natural resource sites. Unfortunately my time on St. Croix would be very short, so I had to make sure I made the most of it.

The Elkhorn coral is an ESA listed species, but it is quite prolific around Buck Island. “I was swimming in the Caribbean…”

We hit the ground running. Clayton Pollock, the Park Diving Officer for the Buck Island Reef National Monument, picked me up from the airport the night I arrived and briefed me on the schedule for the next few days. It seems I could actually be useful during my time at BUIS. The marine park on St. Croix is home to a variety of ambitious project, one of which is a large-scale marine tracking program.

As a joint project between the Park Service, the University of the Virgin Island, the USGS, SFCN, NOAA, the USVI Department of Planning and Natural Resources Division of Fish and Wild Life, TNC, UMass Amherst and UMiami, 145 of acoustic receivers have been deployed at depth around Buck Island and offshore of St. Croix According to Clayton Pollock, the project goal is “to better understand animal movements within marine ecosystems and sustain the efficacy and connectivity between MPAs.” These collaborators are interested in tracking different organisms, such as sharks, turtles, fish, conch and lobsters. If a tagged organism happens to swim past one of the acoustic receivers, the tag is pinged and the signature is recorded on the receiver. Every once and a while the receivers are brought back up to the surface where the information can be downloaded and parceled out to the different private investigators.

Even though the receiver recovery dives had to be quick, the depths we went to still warranted a safety stop. Here Chris Biggs, a graduate student from UVI hangs mid-water, cleaning a receiver. The calm beneath the surface belies the stormy conditions above.

However, these receivers need to be serviced every once in a while, and as luck would have it 21 of the needed to be serviced ASAP. Because I happen to be on island at the time, I volunteered to join the UVI crew tasked with retrieving the receivers, so Clayton could continue the arduous task of prepping for the 2015 turtle-monitoring season. Much like on St. John the weather forecast for St. Croix didn’t look too pleasant, but we had a big job to do.

The receivers were moored over reefs at depths ranging from 10ft to 70ft, so it took quite a lot of energy to execute the dives. We would deploy two divers with a float, accounting for the ripping currents, unhook the receivers from their moorings, ascend to the surface, load our gear onto the boat, and motor to the next site to do it all over again. Couple that with 25knot winds and 4-6ft seas and we were in for quite a day. Even though it took all day, we managed to retrieve all 21 of the receivers.

In order to efficiently execute our dives, we entered the water already negatively buoyant, so that the current wouldn’t have too much time to blow us off of our mark. Chris would bomb down to the mooring, while I hung above him with a surface marker buoy.

The next day Clayton and I headed out to Buck Island, which is only about a 15min boat ride from St. Croix, to deploy 3 of the receivers. They were all in relatively shallow water, and thankfully we could take a more relaxed pace. The waters around Buck Island were much more sheltered, and I was absolutely blown away by the natural resources surrounding BUIS. Diving around St. John was spectacular, but the cerulean waters and colorful fringing reef around Buck Island is a site to behold. Especially when you surface just off shore from picturesque white sand beaches.

Still in the protection of the harbor, the conditions deteriorated just off shore from St. Croix. At least both the rain and the ocean were warm.

The Park Service has gone to great lengths to protect the cultural and natural resources on St. Croix and Buck Island, and I was absolutely blown away by both. After a quick orientation dive around BUIS, we headed back to Christiansted, the historic district on St. Croix where the Park’s HQ are located. The Park’s offices are housed in a historic building built by Danish colonists, and are right across the street from an old Danish Fort. As we prepared for turtle season, I marveled at the classic colonial Caribbean buildings, which looked like something right out of a movie set.

Just across the street from the Park’s HQ lies the historic Danish fort. Originally built to protect overseas interests, the historic site attracts visitors from all walks of life.

However, I didn’t have much time to wander about. The crux of the field season for BUIS is the Buck Island Sea Turtle Research Program. Every night from mid July through October since 1987 biotechs will wander the beaches of Buck Island, monitoring and documenting the sea turtles that come to dig their nests and lay their eggs. Hawksbills, greens and loggerheads are among the types of turtles that call the Caribbean home, and for generations female turtles haul themselves up onto the idyllic beaches under the cover of darkness to start an ancient cycle over again. Turtles that have tags on them are recorded, and tissue samples are taken as well. New females are tagged and logged; hopefully they’ll return year after year. Because female turtles return to the same beaches every time they lay, a lot of good data can be taken.

While there is a relatively established trail further inland, the BISTRP crews must hug the water line looking for turtles. Clayton Pollock helps clear a trail through Buck Island’s dense tropical bush. Imagine crawling through that in the middle of the night!

Ever year 4 new seasonal biotechs are brought on to monitoring the beaches, and as luck would have it I happened to be on island for the first two nights of training. Lucky for me both because I got to see what training looks like, and because we only were doing half-nights, not a full 12hr night. After meeting up with the new seasonals, Clayton, Tessa (a previous seasonal turned fulltime biotech), Alex (a volunteer and previous seasonal) and I all headed out to Buck Island. As the sun dipped behind the horizon we discussed the protocols and divvied up the gear.

Buck Island is little more than a hill sticking up out of the water. However, over the course of the season over 100 turtles will lay their eggs in nests along the 2km of beach. Divided into a Southern and Northern patrol, the biotechs will take shifts slowly walking the beaches by themselves looking for turtles. During training however, we went in groups and took a leisurely pace. Even though Buck Island is open to visitors (only during the day during turtle season) most of the “paths” the biotechs follow needed to be cleared.

Even though we didn’t see any turtles over the 2 nights we spent on BUIS, it was still a really neat experience. Not many people get the opportunity to stroll the beaches of BUIS, which sounds a lot easier than it really is. Even though the temperature hovers in the low 80s at night, biotechs were pants in order to protect them from thorny or poisonous pants. And closed toed, waterproof shoes. We had to bushwhack through dense underbrush, through the lapping waves and over wide swaths of sandy beaches. Again, this sounds like a walk in the park, but each patrol takes an hour, and typically one does 8 or so patrols a night. It takes a lot of work, and that’s without finding any turtles.

As the sun sets past West Beach, the day is just beginning for the BISTRP crews. Come rain or shine, they must adopt a nocturnal schedule for the next 12 weeks, but at least they’re greeted by spectacular sunsets and a sky full of stars.

Even though I was kept very busy at BUIS, my time was unfortunately short. After an exhausting couple of days, it’s time to head back to Biscayne National Park for one more week of south Florida diving. I’d like to thank Clayton Pollock, Tessa Code, Alex Gulick, and the 2015 BISTRP crew. Good luck turtle lurking!

Thanks for reading!

After saying my goodbyes to the good folks at BISC, I jumped on a plane and headed into the heart of the Caribbean, the US Virgin Islands. After landing on the island of St. Thomas, I was met byMikey Kent, the Virgin Islands National Park’s Park Diving Officer. We headed over to the island of St. John via ferry and headed up to the Biosphere, VIIS’s HQ. Because I had arrived on a Friday afternoon, we had the weekend ahead of us before starting work on Monday. I happened to land during the final few days of Carnival, the Caribbean’s summer celebration. Let’s just say that when Monday rolled around I was ready to get to work.

Escaping the heat on land, I dove in the Park’s cerulean water every chance I could.

The Virgin Islands National Park covers nearly 60% of the island of St. John, but the majority of the Park actually encompasses the outlying marine area as well. Because of the island’s prime location, thousands of visitors are drawn the Park’s waters each year. And the marine crew here at VIIS has their work cut out for them. If you’ve ever camped in a National Park, you’re probably familiar with an “iron ranger”, also known as a fee station.

The majority of the visitors to VIIS arrive on private boats. In order to accommodate these visitors, the Park Service maintains hundreds of moorings. If you want to spend the night, you’ve got to register with a floating ranger.

Because the majority of the Park covers the water, the Park Service has hundreds of boat moorings scattered across the island of St John. Located in sheltered coves along the shore of the picturesque island, visitors can tie up their boats for the night if they register with a floating iron ranger. However, these buoys need regular maintenance, and that’s where the Park Service comes in.

During my first day at VIIS Mikey took me on a tour of the Park’s facilities, which are starkly similar to the ones in American Samoa. We also get a chance to dive in the Park, which was a refreshing after 4 days of being dry. However, after a fun day of exploring and orienting, it was time to get down to business.

Though not as big of an issue in the USVI, lionfish have spread from South Florida to Belize. On one of our orientation dives Mikey and I found and dispatched a pair of lionfish.

On my second day at VIIS I was invited to participate on an 8-hour commercial diving instruction session. All of the diving I have done with the Park thus far has fallen under the Scientific Diving standard, which is exempt from OSHA’s commercial standards, while still being in compliance. However, the maintenance of VIIS’s buoy and ATON (aids to navigation) arrays fall under OSHA’s commercial diving standards. The Park wanted to step up a few of its divers, and I got a chance to expand my knowledge.

There are a lot of different rules regarding commercial diving, and I won’t bore you with the details. The key difference between a standard science dive and a commercial dive is the amount of people you need. In order to execute a dive safely you always need a buddy when in the water, so essentially the smallest science dive team could just be two divers. For commercial diving you need three people; a diver, a tender and a designated person in charge. The diver is the one on SCUBA executing the task, the tender sits on the surface tending a line connected to the diver, and the designated person in charge (DPIC) is running the topside show.

A veteran of the VIIS aquatic team, Devin demonstrates how the moorings are connected from the surface to the substrate. Take a good look now, because underwater every surface will be covered in some sort of organism.

The diver, connected by a tether, technically has a buddy, the tender, who feeds out line or pulls it back in depending on the scenario. If the line is too tight it will prevent the diver from doing his/her job. If there is too much slack out then the diver is at risk of getting entangled. The tender is also in charge of communicating with the diver. Two pulls mean everything is OK, three means I need something and four means get me out of here! The DPIC is usually the person with the most experience for that particular task. He/she knows ever aspect of the dive, and can anticipate any issues the diver might encounter. For example, if the diver gives three pulls on the line, they might be asking for a tool and the DPIC should know which tool they need. Also, as an added safety precaution, the diver has to always carry a “pony bottle” (a very small scuba tank) strapped to his/her main tank with an independent regulator, just in case. Remember, there is only one diver in the water so if you run out of air you’re really on your own. The tender is always ready, with gear configured, to jump in the water as a safety diver in case of emergencies.

After a half-day in the classroom, we headed out onto the Park’s waters to learn about the different mooring configurations and to get a little in-water experience. After working on equipment with the Park Service in Glen Canyon I thought messing with shackles and pry-bars underwater would be easy. I should have known better; seawater and metal are quite reactive underwater. Plus, the mooring lines are invariably covered in fouling organisms such as algae, razor clams and fire coral. After nearly digging myself into the sand trying to pry a shackle loose, I definitely have a lot more respect for the aquatic crew at VIIS. Though they’re mostly biotechs, they maintain over 200 moorings across the Park. Oh, and there are only three full time divers by the way.

Dave, a law enforcement ranger, occasionally with the biotechs from time to time. Amidst the chaos of the disturbed bottom, Dave wrestles with a shackle on the underside of a mooring.

On day three I was officially stepped up to participate on some working dives with VIIS. I jumped in the water with one of the biotechs to retrieve a mooring ball that had been hit by a boat and sank. We had to use a 50lb lift bag, which was a lot of work. After that, I spent the rest of the day switching off as either a tender or a diver. Commercial diving is definitely a far cry from science diving, and by the end of the day I was exhausted. But that’s just another day for the crew at VIIS.

Biotech Adam helps keep the lift bag’s position in the water column. After dropping down the mooring line into 50ft of water, we had to find the unattached mooring ball and bring it back to the surface.

On day four, Mikey and I switched things up a little. The Virgin Islands has a plethora of natural and cultural resources, and I was fortunate enough to join the Park’s archeologist, Ken Wild, for a day of cultural resource diving. My background in marine ecology didn’t lend itself to underwater archeology, but it was really great to see another aspect of underwater science. Ken has had a lifetime of experience in the Atlantic and Caribbean, just being on the boat with him it was hard not to absorb some of the history from the surrounding area. We checked out some anomalies from a historic site around St. Thomas, and then investigated a shipwreck that Ken found in the shallows right around the corner from the Biosphere.

Sitting in about 8ft of water inside the Park boundary, the anchor has been resting on the bottom for at least 150 years.

If my week wasn’t interesting enough, on day 5 I jumped in the water with VIIS’s biologist, Thomas Kelley. Thomas is another titan in the Caribbean, and together we explored a few of the Park’s more interesting reefs. Thomas was preparing for next week’s big coral reef research foray, NPS/NOAA’s biennial Fish Blitz. Much like diving with Ken, while diving with Thomas I absorbed a lot of information regarding the natural resources VIIS has to offer.

Over the weekend Mikey kept me in the water by offering to let me dive with a local dive shop, and in return I shadowed a basic open water scuba course he was conducting. In one week I managed to dive every day. From commercial diving to cultural resource diving, natural resource diving to recreational diving and finally professional diving. But my time with VIIS wasn’t over yet! Every other year NOAA partners with the Park Service to survey the reefs around the US Virgin Islands with tremendous detail. Although I had missed the Blitz on St. Croix, I was fortunate enough to participate on the first two days on St. John.

On another site Mikey took line point index data while a NOAA intern took benthic habitat data behind him.

On Monday the ragtag group of NOAA biologists gathered at the Biosphere to shake hands with the Park Service crew, some of which had come from Florida to help out for the next two weeks. After the meet and great, and a couple of hours in the office, we headed down to the water to get the show on the road. NOAA scientists had generated dozens of GPS coordinates scattered across water from St. John to the outer edge of the territorial boundaries (the British Virgin islands are almost within swimming distance of the USVI at some places). Instead of diving known sites, we would be dropping into the unknown to sample the benthic habitat, and the diversity and abundance of fish.

The sits from the Fish Blitz range in depth from 15ft to 99ft. Here Mikey Kent takes a line point index in about 90ft of water.

The crew was split into three teams across three boats, and from the harbor we motored to our sites. On a typical Fish Blitz day each team will sample 5-6 sites; if all goes well each site will only take a team 1 dive. In order to reduce surface interval times, the teams use Nitrox instead of compressed air. However, this added a further complication because the closest Nitrox compressor is at a dive shop on St. Thomas. One boat became the dedicated tank boat; towards the end of the day we would call our dives early, round up the empties from the other boats and motor to St. Thomas to get the tanks filled. Because I was only an observer on the Fish Blitz I volunteered to help on the tank ferry.

The two days I got to participate on the Fish Blitz were very exciting, and all too familiar at the same time. Much like the Kelp Forest Monitoring project, there is an immense data set that the Fish Blitz adds to. From coral health and rugosity, to benthic habitat and fish diversity, the Blitz covers it all.

After a week and a half on St. John, it was time to pack up my bags and head over to the nearby island of St. Croix. Most of all I’d like to thank Mikey Kent for keeping me in the water every day, and for giving me a place to stay. I’d also like to thank Thomas Kelly, Jeff Miller, Ken Wild, and Alanna Smith for putting up with me. Stay loose St. John!

As lush as the tropics are above the water, the coral reefs of the US Virgin Islands are home to a fecundity of fish, invertebrate and algae species. The orange coral, Acropora palmate, is an ESA listed species. It was good to see so much of it in the Park.

Thanks for reading!

After a week of decompression training and diving, it was time to ditch my bailout bottle and strap on a regular SCUBA unit. As part of deal with the University of Miami, a few lucky graduate students get to spearhead their own research projects while working as biotechs at BISC. During my second week at the Park I got to participate on a few of the projects they’re working on.

UM graduate student Dana bagging a lionfish. Dana’s project involves lionfish outreach and education; this fish will be used to help spread more information.

Remember from my last post how I mentioned that the Park had requested deco training so they could extend the reach of their lionfish-culling project? Well, you might ask, why are they hunting lionfish in the first place? Don’t these beautiful fish have just as much right to the reefs as we do? The answer is no. Lionfish are native to the western parts of the Indo-Pacific, not the Atlantic and Caribbean. They inhabit coral reefs, preying upon just about anything that they can fit into their mouths. Lionfish are quite popular in the commercial aquarium trade, and unfortunately they were accidently introduced to Biscayne Bay about 20 years ago. Since then they have spread like wildfire across the Caribbean, Atlantic and even into the Gulf of Mexico.

Shelby Moneysmith, BISC’s PDO and the region’s RDO is still a biotech at heart. I haven’t gotten a picture of a live lionfish yet because Shelby and the rest of the biotechs are too good at finding them before I do!

Lionfish are such potent invaders because they have no natural predators on the East Coast. Also, they tend to specialize in eating young fish, which further complicates the issue. BISC has gone through considerable lengths to try and cull lionfish as much as possible. Not only does the Park dispatch the intruders, they also study their diet and behavior. Lionfish are shot at depth using a poll spear, and then brought to the surface. Back at HQ the lionfish are measured, tagged and frozen. Every so often the Park distributes the lionfish to local schools for outreach and science education. Of course, every once and awhile a hungry biotech can fillet a fish or two.

UM graduate student Nicole Besemser nabs a lionfish on one of the Park’s outer reefs.

After being brought back to HQ, lionfish are measured and tagged. The data collected by the Park goes back to just after the start of the invasion.

I’ve worked on projects in the past where culling is a major part of the investigation. While I cannot support aimless killing, it’s remarkable to see how negative of an effect these lionfish can have on a reef. I was really glad to have been able to participate on this project, both on deco and at shallower depths. Also, I couldn’t help but try my hand a cooking up some lionfish fillets for myself!

Not all of the lionfish made it into the freezer. As part of outreach, some folks are trying to get lionfish on the menu at local restaurants. I recommend the fish tacos!

After diving with the Park for over a week it was time to switch gears and try my hand on some other projects. I was able to join two other graduate students for a couple of days working a turtle nesting project and a coral recovery project. Both studies involve making observations in the field, and analyzing the data back in the lab. Because neither involves SCUBA, things were (superficially) less complicated. Or so I thought!

Typically beaches along the edges of the outlying keys are sampled for potential turtle nests multiple times a week. Loggerheads, greens and hawksbills are just a few of the turtles that might utilize the relatively projected sandy shores of the Park to lay their eggs. However, these turtles lay their eggs by night, which definitely complicates the issue. To monitor the beaches for new nests, we drove a Park boat from key to key, wading out in shallow water to walk along the hot, sandy, bug infested shores looking for signs of activity. If a new nest is found, the interns (who get incredibly excited when a nest is found) carefully dig in the sand. Once the eggs are located they are reburied and a protective mesh screen is placed on top. After about 2 months the screen is removed so that the hatchlings can head for the cover of the ocean. It was hard work! But definitely rewarding.

UM graduate student Kelsey Armstrong suites up to survey a beach for potential sea turtle nests. The sun is hot but the bugs still bite!

UM graduate student Tina Van Doornik prepares to wade to shore. We walked along the sandy beaches of the keys looking for sea turtle activity. It was kind of nerve-wracking wading through the warm shallow water, but Tina’s enthusiasm for sea turtles was infectious.

After scouring the beaches for nests all morning we headed to a shallow reef to anchor the boat and do coral health surveys. About 6 months ago a handful of young individual corals were sampled. Sizes were measured and pictures were taken. You can get a general idea about a coral’s well being based on tissue color. Corals have a symbiotic algae living in their tissue, and these algae make sugar from the sun, and in turn nourish the coral. They also give the coral their vibrant colors. If a coral becomes stressed it will release the algae. A “bleached” coral is not happy, and although they may recover, typically this leads to the death of the reef.

Our task for this project was to try and local the small individuals based on pictures taken months ago. Once we found our target, we assessed their health (bleached, recovered, or dead) and took pictures for comparison. This was all easier said than done. The shallow reef was exposed to wind and swell, and since we were doing these surveys using snorkels we got moved around quite a bit.

These three projects are prime examples the natural resource work conducted by the Park Service. In collaboration with local institutions, our natural and cultural resources are well studied and managed. It was really excited to participate on so many projects, especially since working in tropical ecosystems is still relatively new to me. I’d like to thank the UM graduate students Dana Tricarico, Nicole Besemer, Kelsey Armstrong, and Tina Van Doornik for letting me tag along. Now I’m off to the Virgin Islands National Park to continue my dive training.

There’s one thing I can tell you for sure, Florida and Oregon are definitely on opposite sides of the continent. After leaving the burgeoning summer in the Pacific Northwest, I arrived in south Florida some 20 hours later. There I met up with Brett Seymour, Deputy Chief of the SRC, and together we headed to Biscayne National Park at the southern end of Biscayne Bay.

A little known Park, BISC covers 172, 971 acres of Biscayne Bay. While the eastern most edge of this mostly marine park is delineated by a depth contour of 60ft, the majority of the Park is westward of the outlying keys, which presents some very interesting navigation hazards. After spending 2 weeks in American Samoa, and another on Oahu, you’d think that I would be accustomed to summertime weather in the tropics. But I guess a week on the Channel Islands and another at Crater Lake spoiled me. My head was positively spinning when I got to BISC. Mangroves border the water’s edge, while cicadas drown out all but the loudest boats. But I didn’t have much time to soak in the tropical climate; we had to work to do.

We were luck to have Steve Sellers, the NPS’s DSO, provide the instruction for the deco class. Maintaining buoyancy midwater during a long safety stop while keeping control of a surface marker buoy can be pretty tiring after a long dive. Steve showed us the proper way to “hang on a bag” so that you’re keeping tension on the SMB without having it pull you up, or you pulling it down.

BISC has one of the most ambitious diving operations in the Park Service. Divers are usually in the water almost every day, working on a variety of interesting projects. Biscayne Bay is home to a wide array of shipwrecks and other cultural resources dating back several centuries. But the natural resources of the Park are just as interesting. Most people don’t associate the United States with coral reefs, aside from Hawaii of course, but southern Florida is home to prolific coral reefs. However, there are increasing environmental and anthropological pressures threatening the reefs and cultural resources of BISC, and that’s where the Park Service comes in.

To help combat an invasion of lionfish of epic proportions (more on that later) Park Services divers cull these dangerous trespassers with all they’ve got. However, the sneaky fish are found ever deeper, so the park management of BISC had requested some decompression dive training from the NPS National Dive Safety Officer Steve Sellers with support from the NPS Submerged Resources Center Chief and Deputy, Dave Conlin and Brett Seymour.

On my first full day at the Park I was reacquainted with Dave and Steve, after saying goodbye to them in Denver way back at the beginning of all of this. I also met Shelby Moneysmith, BISC’s tireless Park Diving Officer and the southeast region’s Regional Diving Officer. Shelby had requested this course so that some of her divers extend the lionfish management program to deeper depths. Steve would be teaching the course, with Dave and Brett as support staff, and by some good fortune I was able to participate.

Many SCUBA divers pay close attention to their NDL, the no decompression limit. As a function of breathing compressed air at depth, nitrogen gets diffused into the body’s tissues. As we come up from depth, we need to let the nitrogen safely come out of our tissues in order to avoid complications such as decompression sickness. Most divers won’t stay down long enough to require dangerous amounts of nitrogen, and can theoretically ascend to the surface (safely!) at any time during the dive. Though safety stops (hanging out at 15ft for 3 minutes) should always be made.

With decompression diving, all you’re doing is extending your dive time past the NDL. Essentially you dive deeper, and longer, and then have to make more than one safety stop. I won’t bore you with the details, but just for example after a 120ft dive you might stop at 50ft for 1 min, 40ft for 2 min, 30ft for 4 min and 15ft for 25 min. Of course, that’s all hypothetical. Notice that last stop though, 25 min at 15ft! I’ve had working dives with less bottom time than that! Of course, with decompression diving you’re extending your overall dive time, so you need to plan on bringing a lot more breathing gas than usual. But that’s all part of the training. Are you still with me? Good.

Before any deco dive you need to calculate your respiratory minute volume (RMV), how much gas you breath at depth. From that calculation you can adjust how much gas you’ll need to bring with you to execute a safe dive.

So, day 2 at BISC and we’ve started off our deco training with a nice long classroom session. It had been way too long since I’ve gotten such formal SCUBA instruction! Steve did an excellent job walking us through decompression theory, gas planning and management, contingency planning (safety first!) and safe boating practices. In places like BISC, with a reef on the bottom and nothing but water to the surface, all of those decompression stops are usually done floating in the water column, so you have a lot of different factors to consider.

Shelby Moneysmith, BISC’s tireless PDO (and the region’s RDO) participated in the deco training with us. After we finished training we put our skills to the test, hunting lionfish on a wreck in about 130ft of water.

After a day in the classroom it was time to hit the water. On day 1 of our in-water training we planned on doing two dives each; we were not planning on going into deco. We were tested on our gear handling and gas consumption at depth first. Typically, the bigger the tank the more gas you have to breath and the longer you can dive. We planned on diving with steel 125cfs, that is 125 cubic feet of air. Not only that, but we also each had an aluminum 80 clipped to our sides. With a tank of “back gas” at 125cf, and “off board” tanks at 80cf, we each had a total of 205cf of air to breath! That’s more than 3x what I would normally dive with! Talk about contingency planning. Also, our back gas tanks had H-valves instead of the typical valves you see on a SCUBA tank. The H-valves have to independent regulators connected to them (instead of just 1). That way, if you have a leak on either regulator you can isolate it and save your gas.

When planning a decompression dive, you always need a contingency in case of emergency. Typically you use an H-valve (instead of a regular yoke) with two regulators on your tank (instead of one), that way you can always isolate a regulator if you have an issue. In this picture Mike, one of BISC’s biotechs, practices isolating a regulator. This picture was taken at about 120ft.

Day 1 went smoothly, so for Day 2 we planned on executing an actually deco dive. Here we go. Steve would be leading the dive, with either Brett or Dave accompanying us on their rebreathers (more on that later). We lined the gunnels of our dive boat and waited for the skipper’s call. Because BISC sits at the edge of the Gulf Stream, the currents can absolutely rip through a dive site. You need to be ready to coordinate a drop and get to the bottom as a group as quickly as possible. Head the skippers call; all diver’s ready? dive, dive, dive! We backwards rolled over the rail, and hit the water. Immediately the ache from the heavy tanks is relieved as the buoyancy of seawater does its thing. Our slung 80s moved into position under our flanks, and we dropped into the blue.

It took some getting used to, but after a couple of dives I hardly noticed the tank on my side. Notice the pole spear dangling from my right shoulder; on this day we hunted lionfish on a wreck in about 130ft of water.

What does a coral reef look like at 130ft you ask? Just like it does at 45 or 60ft, except the light is a little dimmer, you’ve got a lot more water above you. What’s it like going into deco you ask? It’s no different than any other dive. Your dive computer starts to freak out at you, but of course we had everything planned. It was a remarkably uneventful dive. We practiced our skills, and took a quick tour, nothing out of the ordinary. Your dive team really needs to be on point for this kind of work, so when we reached our time limit we ascended as a team to your first stop . Then to our next, and finally to our last and longest. It’s strange having a “soft ceiling” above you for the duration of a dive. The water was very clear; you can plainly see the surface from depth. But you can’t go up, not until you’re cleared from each depth-stop. With our surface maker buoys attached to our hand-held reels, we patiently waited for our tissues to off-gas. Floating mid-water over a reef 100ft below you, carried helplessly in a current, can be a little nerve wracking. But of course we stayed as a group, floating together and occasionally signaling to one another. Nothing makes you hungrier than watching your computer count down a 25min stop after an already hour-long dive. I’m bringing a candy bar next time.

Lionfish have no predators in the Atlantic or Caribbean and don’t live long enough to learn to avoid divers. Shelby nabbed this big lionfish under the Bluefire wreck.

Day 3 we repeated the same skills, only this time we brought along pole spears. After manipulating our H-valves, and passing around our off board cylinders, we proceeded to scour the reef, looking for our not-so-elusive prey. After all, the whole point of this training was to allow the participating divers to safely hunt lionfish at deeper spots. Swimming around with a hung tank on your back, a normal sized but still large tank, clipped to your side and a spear in hand isn’t easy. But it was certainly a very good training exercise.

A lionfish may present a danger to any fish smaller than it, but they are also dangerous to anything trying to eat it as well. Armed with multiple sharp and venous spines, they must be properly handed to avoid injury. Terry, a long time volunteer with BISC, has helped cull the lionfish outbreak in the Park for years.

After 4 days of deco training, Steve gave Shelby and the BISC divers the green light to continue their operations at deeper depths. Watch out lionfish. But the SRC wasn’t content to sit by and watch, they had their own dives to do. Because of the SRC’s mandate to support underwater resources in parks at a wide range of depths and environments they use closed circuit rebreathers to extend their bottom times, decrease their decompression times, and most importantly accomplish both in the safest manner possible. Normal SCUBA diving is considered open circuit; you take a breath off of your regulator, and exhale it out into the water (hence all the bubbles). Rebreathers recirculate your exhalation, remove the excess CO² and pump back in oxygen to balance the breathing mixture. No exhalations, no bubbles. Rebreathers look like spaces suites without all the body constriction, and are about as complicated.

Prior to entering the water on a closed-circuit rebreather (CCR), divers must first pre-breath their gas mixture to make sure everything is functioning properly. From left to right: Steve Sellers (the NPS’s DSO), Dave Conlin (the SRC’s Chief) and Brett Seymour (the SRC’s Deputy Chief).

Dave, Brett and Steve wanted to execute some mixed gas decompression dives to maintain proficiency. Their target was 220ft using a special breathing mix called trimix. I won’t bore you with the details again, but in short trimix uses helium to replace a portion of nitrogen in the breathing mix to minimize nitrogen narcosis at depth. In order to get the gas mixtures precise they had to spend hours at the dive locker balancing the gas mixes and filling their rebreather cylinders and off board “bail out” bottles with the special mixture before diving the next day. Though they’ll never admit it, these guys are kind of a big deal.

After coming up from their dive to 220ft, the SRC had plenty of time to decompress. They had to spend over a 30min just at 20ft to decompress safely. Notice the lack of bubbles? CCRs recirculate air back into the mix. From left to right: Dave, Steve, and Brett.

Days 4 and 5 we accompanied the SRC out to their site, where they would make a live drop with a narrow window down to 220-230ft to a wreck site called the Sir Scott. After they came back, some 90 minutes later, it would be our turn to drop down, to much shallower depths of course, and hunt for lionfish.  As they worked out their kinks, I was continuously impressed with how humble and nonchalant they were. Refusing help with their rebreathers, off board 80s and 40’s so they knew exactly where everything was in case of emergency, they were more than eager to help us load up with all of our gear.

One thing to consider when planning a deco dive is the amount of time you need to decompress in the water column. Floating midwater can be a little nerve wracking, especially when big toothy things are cruising near by. However, sharks play a vital role in the ocean, and have gotten a bad rap over the years. It was awesome getting to see this 6ft silky shark, even if he got a little too close for comfort.

Steve, Brett and Dave worked through the weekend to help us get comfortable with deco diving, and wasted little time achieving their goals as well. I’d really like to thank them for all of their help. And of course Shelby Moneysmith as well, for being continuously patient and in good spirits no matter what happened. Now that training is over, I can finally get to work with the Resource Management team here at BISC.

Thanks for reading!