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Rebreathers for Cave Diving

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Rebreathers for Cave Diving technical The use of rebreathers in caves is nothing matters new. Decades ago, Hans and Lotte Hass used them to venture into marine caves. Profiles like Rob Palmer in the UK, Bill Stone, George Irvine and Jarrod Jablonski in the USA, or Olivier Isler in Europe, are also strongly linked to rebreathers and cave diving. Recreational cave divers discovered Oxygen CCR in the Navy sur- plus, then experimented with Draeger Dolphins, and more recently, APD Inspiration. Nowadays, there are many different brands and models, and they become even more popular within the cave diving community worldwide. Text: by Cedric Verdier Photos by JP Bresser Rebreather for Cave Diving 67 X-RAY MAG : 28 : 2009 EDITORIAL FEATURES TRAVEL NEWS EQUIPMENT BOOKS SCIENCE & ECOLOGY EDUCATION PROFILES PORTFOLIO CLASSIFIED Why? to look for them. A light failure or a com- So, why use a rebreather for cave diving, plete silt-out is also a situation where and what kind of benefits does this type extra time is needed, as the progression of equipment have compared to the to the exit is very often drastically slowed highly reliable conventional Open Circuit down. scuba? Good buoyancy characteristics. In cave Extended dive time. One of main diving, buoyancy control is obviously one advantages of a rebreather is that it of the most important skills, as it prevents makes longer dives possible. In a cave, silt from lifting up off the bottom. With a that translates into extended explora- rebreather, the buoyancy of the tanks tions and the ability to do penetration remain almost constant throughout the dives much longer and further than what dive. Therefore, it is not necessary with would be possible with conventional extra weights to compensate for the open circuit scuba. But the rebreather added buoyancy of tanks going empty also gives an additional safety margin, as towards the end of the dive. Less weight it provides the cave diver with more time also means a better trim and less energy to handle emergencies. It could be a lost spent when moving underwater. line scenario, where the way to the exit is unknown, or a situation when a team Lack of bubbles. A constant problem member is lost, and extra time is required cave divers face with OC scuba is called percolation. Bubbles make their way to the walls and the ceiling of the cave and dislodge some silt. This is not an issue when diving with a rebreather. It also helps improving communication (it’s possible to talk in the mouthpiece) and maintains the silence that most people are looking for in a cave. Mixed-gas flexibility. A mixed-gas CCR offers quite a lot of benefits for the exploration of unknown cave systems. located in cold/cool water (with the With a rebreather, the buoyancy of the tanks Dive planning is easier when it comes to exception of places like Mexico and remain almost constant throughout the dive. gas mix selection, even if one doesn’t Cuba). A rebreather provides divers with know exactly how deep the cave is; the some additional warmth, as they are The rebreather same diluent can be used for a larger breathing warm circulated air rather times unrealistic if the dives have to be also gives an depth range than the same mix used inhaling cold air from a tank—a definite done on conventional scuba equipment. additional on OC. A mixed-gas CCR also gives the benefit when the total dive time is a mat- Regardless of the bailout gas to be used, safety margin, best decompression mix when it’s time ter of hours. rebreathers help to have smaller and as it provides to ascend—and it could be quite often more flexible logistics. A booster pump the cave diver during a cave dive—ending up with a Weight. Many caves are in remote and a few tubs of sodalime give the with more perfect yo-yo profile. areas. When a cave diving team wants opportunity to explore virtually any cave time to handle to explore some deep caves, the system. emergencies. Warmth. Most of the cave systems are amount of gas to be carried is some- 68 X-RAY MAG : 28 : 2009 EDITORIAL FEATURES TRAVEL NEWS EQUIPMENT BOOKS SCIENCE & ECOLOGY EDUCATION PROFILES PORTFOLIO CLASSIFIED Rebreather for Cave Diving Obviously rebreathers are very useful tools for the cave explorer. But simply having a rebreather is not displayed on the handset(s), but in a to make the diver bottom heavy. It could and free of danglies (LP hoses, handset mode). The additional cylinders signifi- enough to go cave diving. There are cave, you need your hands free to per- be because of their different components cables, etc). cantly increasing the possible duration some necessary features and safety form other tasks like reeling in and out (tanks and scrubber, OTS or back-mount- and range of the diver, it would then be components that need to be there. the guideline, setting up a jump, squeez- ed Counter-Lungs, etc) or because of the Off-board gas switching capability. For nice to make sure that all the fittings are ing through a restriction, riding a scooter, diver him/herself and the dive gear (dry/ cave diving, this is a very important fea- the same and that all additional tanks A Head-Up Display. An HUD is a key mapping, etc. In an emergency situation wet suit, heavy fins, canister light, etc). ture. It gives you the possibility to use (sling or staged) have an LP hose fitted. piece of equipment for safe cave div- (complete light failure), one can even Before venturing into a cave, it’s essential different off-board cylinders and to plug ing. It tells you if you are breathing the use the small amount of light made by to make sure that the trim is appropriate them into the loop. In case of gas deple- A safe way to the exit. All cave divers right mix and can even inform you about the HUD to keep a visual contact with (horizontal position, slightly head-down tion, electronics failure, equipment fail- have to make sure that they can safely other potential problems (O2 sensors, the line while looking for a back-up light. feet up), thanks to some adjustments and ure, scrubber failure, the diver can still come back to the exit (and the sur- battery power, decompression require- maybe some trim weights. It’s also impor- stay on the loop while manually flying the face!) if they have to go off the loop for ments, etc). All this information is normally Trim. Some rebreathers have a tendency tant that the configuration is streamlined unit, (Closed, Semi-Closed or open loop any reason (mainly Total Loop Flooding 69 X-RAY MAG : 28 : 2009 EDITORIAL FEATURES TRAVEL NEWS EQUIPMENT BOOKS SCIENCE & ECOLOGY EDUCATION PROFILES PORTFOLIO CLASSIFIED or severe hypercapnia). In most of Task-loading. Never forget that cave needs discipline not to exceed the so- the cases, it means carrying enough diving is a very demanding activity. easily-exceeded limits. If one exceeds Open Circuit gas for a complete bail- There are simply so many things to do their limits and gets away with it very out exit, but it could also be a Bail-out and to think about. Situation awareness often, it could seem safe to do so.... until Rebreather when the amount of gas is an important component of every the day something goes wrong, which needed is simply too big. cave dive. Therefore, adding another could take years to happen. task loading equipment like a rebreath- A rebreather is a very convenient A Bail-Out Valve. A BOV is very useful er doesn’t help to deal with the normal tool to further explore a cave system. to have on a rebreather when cave flow of a cave dive, and even less It’s also a good solution for some of the diving to avoid task loading in case when dealing with an emergency situ- emergency situations that can occur in of emergency. When something goes ation. a cave. Nevertheless, despite all of the wrong with the rebreather, it is safer benefits listed above, it’s not an easy- and easier to quickly switch to Open Discipline to-use tool that can be immediately Circuit, sort the buoyancy out, lock off As we often say when teaching cave div- adapted to one’s needs. An experi- the reel, etc, then check out what hap- ing courses, “Cave diving is not for eve- enced OC cave diver or an experi- pens and what to do. Furthermore, a ryone!” Add rebreathers to the equation, enced rebreather diver needs time to diver suffering from CO2 toxicity might and we would say, “Cave diving with a be able to safely combine both tech- have a hard time removing their mouth- rebreather is definitely not for everyone!” niques. When they reach this state, they piece and replacing it with a regulator One has to be a very experienced CCR get the best of both worlds! ■ because their breathing action is invol- diver before starting any dive in an over- untary. It they try, there is a real risk that head environment. The main attribute Never forget that cave diving is a they will breathe in water. When using of a CCR Cave diver is discipline. One very demanding activity a rebreather in a cave, CO2 toxicity is a very real possibility when one has to fight against a current or go through a restriction. A BOV is a quick and safe solution, at least for some sanity breaths, time to calm down and switch to the OC bailout tank.
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