Genesis

This is interesting.....

There is no difference between TTS from 20' to surface if you are at 100% FO2 inspired irrespective of whether you do the whole thing at 20', do some of it at 20' and 10', or do a "continuous deco" ascent to the surface.

The offgassing rate of inert gas(es) from your body is exactly identical, because the inspired amount of inert gas is zero.

The pressure gradient to ambient has nothing to do with offgassing rate - that is controlled by the gradient between F(inert) inspired : F(inert) tissue. If F(inert)inspired is zero, you cannot drive the offgassing any faster.

Your minimum safe depth is controlled by the overpressure in your tissues, but not the rate of offgassing. Of course there's a fairly significant difference in CNS clock accumulation between 20' and 10' though at 100% FiO2.....

Is there transparency of any sort in the HH's deco algorythm? This is one of the issues that I've run across with various decompression strategies - too many are "black boxes" with little or documentation on how they work, and when you see things like this it makes you wonder exactly what its doing in the code....

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