Charlie99
Contributor
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1. The problem is that the student did NOT know the actual profile. Clearly he did not know the intended profile, nor did he calculate and plan the dive ahead of time. Furthermore, he didn't have a computer, and instead the two of them relied upon the instructor's computer. These problems exist whether or not there was the additional standards violation of exceeding 100'.ScubaToneDog once bubbled...
30 minutes at 110'....I doubt you could make an 80CF tank last that long(Im assuming 80CF) that deep.
<snipped irrelevant details of possible multi-level dive>
2. 110' is 4.34ata. 30 minutes at 110' is equal to 130 minutes at the surface. Using 65 cu ft (leaving 500psi reserve) this a very reasonable 0.5 cu ft / min SAC --- not at all uncommon and one that I can do while swimming at a pretty good pace.