Good thread you've started here, thanx.
There are two things I'd like to add to contribute my 2 cents worth if I may.
I have as yet to purchase my float tube but within the past 2 months that I have been considering the best option for what I would like to catch up to in the water. I have decided to look for a v boat type with 2 separate bladders just as a safety precaution. If one goes there is always the other to hang on to while kicking your way back to the shore.
The second thing I would like to offer is that I always keep a sharp pocket knife on my person for those moments that you have to cut yourself loose and in thinking over a situation where you are in the water and your pvc water is taking on water, life over property is my motto. If you can stay calm enough to work your hand back into your wader after unclipping the buckles to reach the knife in your pocket, open it and use it to stab outwards as low as you can possibly get your arm into the wader and cut upward to try and release some of the resistance the wader offers by holding onto your body. The biggest hurdle to me in this situation is getting your feet out of the boots.
Easier said than done though, I hope we never get into this type of situation though but trying to think it over logically might save you or one of our fellow bassers.
Most of the world is covered by water. A fisherman's job is simple: Pick out the best parts.
Charles Waterman