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Hi Brent. I think the worry here with blowing your MBT's at depth is
basically an uncontrolled ascent. this is very dangerous. Not only
because a boat or other object may be above you ( not likely) but because of the
rapid pressure changes as you rise, and the uncontrolled way that a big bubble
of air acts when expanding.
If you go from 300 feet to 200 feet, maybe not a problem but once you start
up you can't stop. Unless your ballast tank is completely open on the bottom the
air may expand so quickly it would burst your MBT. On the other hand, if your
MBT has no bottom, a quick ascent uncontrolled could tip you over and you'd lose
the bubble and still be in big trouble. Now I think a LITTLE blast of air
into the tanks wouldn't be too bad, and with practice you could probably figure
out how much is too much for whatever circumstance you're in. Depending on what
type of tank, how big the sub, how deep you are, how much air you have in
reserve, how stable the sub is, how big are the valves, etc, etc.
Still, the accepted method seems to be to use the hard tanks and motors to
ascend slowly, and blow the MBT's at or near the surface. This is one instance
where it's good to be a "control freak"
Frank D. |