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At 10:52 AM 7/19/00 +0200, Simon Murray wrote: Hello Simon, >Has anybody given thought to a maximum 'safe' tech diving limit i.e. a depth beyond which the margin for error is so small and the risk of accident so great that it becomes unacceptable. For example I understand that the recent GUE Britannic dives were at 400 feet (120m), is this around the limit ? There's no one hard number beyond which risk becomes unacceptable, but generally, beyond about 300 feet, the margin becomes very small. For example, on an easy 200 foot dive, staying a few seconds past your planned bottom time has an insignificant impact on your deco obligation, but on a 400 foot dive, for every *six* seconds or so you go past your planned bottom time, you incur a full minute of additional decompression. A problem on the bottom that prevents you from beginning your ascent for one minute will add around 12 minutes of additional deco. Compound this with the additional back-gas you use at that depth (you can actually see the needle on the pressure gauge drop with each breath!!!) and it becomes pretty obvious that even a minor mistake that deep could cost you your life. -Mike Rodriguez <mikey@mi*.ne*> http://www.mikey.net/aue Pn(x) = (1/(2^n)n!)[d/dx]^n(x^2 - 1)^n -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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