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Greetings! I am a new member, and have been following the posts regarding deep air vs. Trimix and Heliox. I have to admit that I am almost afraid to raise my hand. I have been doing dives in the range of 130fsw-200fsw in Carmel Bay, Calif.. Typically our bottom times are 15-20min, with about 35-45 min. deco. I carry a set of doubles, and sling 50/50 and 80/20. I switch to the 50/50 at 60fsw and the 80/20 at 25fsw. All our dives are done on a line that is dropped with a bottom finder prior to the dive. *** I accept that Helium prevents narcosis, and that diving drunk is risky! *** WHAT ABOUT PHYSIOLOGY? I am particularly interested if there are any differences in the physiological risks to the body at depth with He vs. N2. Are maladies such as Neurological Damage and/or Dysbaric Osteonecrosis the result of vascular damage caused by micro bubbles ( He or N2), -or does the slugging of RBCs secondary to the effects of high ppn2s cause the damage to the tissue? What if any are the differences in physiological risks that He and Nitrogen have to capillary beds when used in a bottom mix? David Horne DVM -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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