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Previous escape attempts show that you don’t want to wait
around for anybody else to clear the sub, get out, and head for the surface
fast. When I say a controlled ascent, I am speaking in terms of escape
and not diving. You want lots of buoyancy, flair your body out (arms
outspread behind your head, your back arched, and head bent backward to given
an open air passage way), and exhale saying “HO, HO, HO”
continually to the surface. You want to commit to escape as soon as you
can as cold and CO2 build-up will make rational thoughts difficult
quickly. If there is no immediate, tenable rescue available from the
surface, you want to get out. Unless practiced ahead of time with drills
(even dry land drills would probably be of great help), the second person in
the sub doesn’t have real good odds for getting out of a single conning
tower PSUB due to their cramped nature. Doug is correct that street cloths and little forethought will
make it difficult to make a successful escape. The fast ascent is
necessary to try to stay within the “No Decompression Limits” but from
chamber experience, for some reason people have more difficulty clearing their
ears in air then when underwater. Submarine escape protocols call for not
considering the ear drums and press down quickly, they will usually heal. I have had the opportunity to practice submarine escape years
ago in the sub escape tower at SUBASE NLON. R/Jay Respectfully, Jay K. Jeffries Andros Is., Bahamas As scarce as the truth is, the supply has always been in excess of
the demand. -Josh Billings From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of djackson99@aol.com To
get bent, you'd need to be exposed beyond the no decompression dive
limits. For ambient I think that's just a matter of watching the dive
computer and don't exceed the no decompression limit. For bailing from a 1 atm
the pressure exposure is going to be limited to when the hull starts to
flood. So you've got to decide if you want to ride to the bottom and wait
for rescue or bail. -----Original Message----- Simon, I gave a
presentation at the PSUBS 2007 Conference on this subject. Argon is
actually a very bad choice, while it is a good thermal insulator (approximately
1.5x air) it is highly narcotic at relatively shallow depths and its greater
density while cause breathing issues. Pre-breathing oxygen can be a good
idea if done before exposure to higher pressures. The best bet is to
press down quickly (you will probably rupture your ear drums) and make a
controlled ascent with a 40 cf bail out tank of air. This is the short
answer. R/Jay Respectfully, Jay K. Jeffries Andros Is., Bahamas As scarce as the truth is, the supply has always been in excess of
the demand. -Josh Billings -----Original Message----- Hopefully someone will have an answer to this; while
pondering atmospheric control, I was trying to figure out the best way
to make things as safe as possible. Hypothetically, let's say you're
in an ambient sub and need to make an emergency surfacing. Or,
you're in a 1atm and need to abandon your vessel - whatever the
circumstance, you need to be exposed to great pressure differentials in a
short space of time. Diving physiology stipulates that you will get the bends.
So, why not control the nitrogen levels in a submersible and replace it
with, say, argon? Are there any specific reasons people do not control
the breathing mix in submersibles the way they are in technical
diving (other than the risk being so minute)? -- "Catapultam habeo. Nisi pecuniam omnem mihi dabis, ad
caput tuum saxum immane mittam." ************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US
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