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Bill, I don’t know the exact reasoning why
it works but anecdotal evidence from the Woodhill Karst Plain Project (WKPP)
deep, long dives, other major arduous diving projects, and discussions with Dr.
Bill Hamilton support this conclusion. Can’t remember exactly but
believe that there has been some formal research also where divers were
monitored ultrasonically for bubble formation. While this doesn’t
necessarily conform to our historical models for decompression, the tech diving
community has definitely pointed out that our Haldanian approach to deco is
wrong. Slower descent, deeper stops, and the use of O2 over
the last 15 years has drastically cut the amount of deco required and lowered
the incidence of deco hits. The micro-bubble release on subsequent
dives (not only bounce dives) was noted by the oil companies while conducting
saturation diving research but wasn’t really released to the public until
the early 80s. It took into the early-90s for it to become common
knowledge in the tech diving community. R/Jay From: owner- Hi Jay. That did indeed answer my original questions, and
excellently so. Thank you very much. I do have a few dive questions about number 2 that you
listed. You said....."Bounce
dives to deeper depths are an animal unto themselves. Recent experiences in the tech diving
world points out that a slower descent is more advantageous for the subsequent
decompression regime followed during ascent (note that all
dives are decompression dives as our ascent rate on supposed no-deco dives is
there to allow elimination of absorbed gases). Additionally, it has been shown through
laboratory hyperbaric experimentation that a bounce dive after a previous dive
should be avoided as the rapid pressurization and depressurization causes a large
quantity of micro-bubbles to be released and this is very undesirable." I am curious how descending more slowly would be more
advantageous for the subsequent decompression regime that as you pointed out is
done on all non deco dives by our ascent rate? I don't understand how this can
be. If you decend more slowly you have more time for nitrogen to saturate your
tissues, so how would decending more slowly and therefore having more time
for nitrogen to saturate your tissues, be advantageous in any way for
your decompression regime on ascent? Wouldn't this mean your bounce dive would become a more
saturated dive and therefore possibly need more deco time which is exactly what
you were trying to avoid by doing the "bounce" dive in the first place? I do know that a bounce dive after a previous dive
without total and complete offgassing is not a good idea for the micro bubble
reasons you stated. Bill Akins. |