You can get the bends from extended periods even at shallow depths like 40
feet. You can also do serious damage to your lungs, eyes,
sinuses,ears, etc. by coming up too fast.
As for controlled ascents, if you bail from the sub, you
probably won't be waiting around for your buddy unless you've got a good air
tank. I plan on carrying two 40 cu.ft. bottles with regulators. They are slim
and will clear the hatch while strapped on. A "horse collar" BC is a good idea
too. Not bulky at all, and with it inflated, it will keep your face out of
the water even if you're unconscious. Frank
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