Quick, crazy question: has anyone ever tried using a lift bag as redundant buoyancy inside a tight situation such as in a wreck or a tight cave passage? Picture a tropical diver in a wetsuit, with doubles in such a situation having a primary bladder failure (say it gets punctured for the sake of argument and is now totally useless) No drysuit backup, and no room to use a liftbag. Here is another example. Many divers here in the North East use double bladders simply because their drysuits alone cannot provide enough buoyancy. Thus they only keep enough air in the drysuit to keep warm and use the BCD for primary buoyancy. Now they have a primary bladder failure. If a liftbag is not usable in the confines of a wreck, and the drysuit cannot provide sufficient lift, what then? This was the thought behind the dual bladder. By not attaching an LPI hose to the backup inflator, and using inflating it orally, the problem of a leaking LPI is eliminated. Granted, many can say that they are overweighted to begin with and looking through a DIR point of view you would be correct. However, the entire world does not dive DIR. Everything else is backed up in technical diving, so in this case the redundant bladder is actually necessary. For DIR style diving, of course it is not. Then again, a DIR diver would not advocate removing their scuba unit to access a small space, where many hard core wreckers will. Different diving styles and situations. Neither is right or wrong, they just are.
Any thoughts?
