This thread reminds me of my only serious underwater accident. The customer made it to 75 feet with the tank completely off. She was a pettite women and had 3500 (or more) to start, so she could breath the "hose air" for a while.
Anyway, when she totally paniced at depth (and completely and repeatedly refused my second stage) I floored the "up" button on her BC.... nothing... I then hauled her to the surface ASAP. As we drug her up on the platform, and before we knew if she had any permanent injuries; you can bet I cranked open that value (without her consent or knowledge).
I figured, if she died it might mitigate our liability...
Better late than never; right?
---------- Post added December 30th, 2012 at 12:01 PM ----------
I've never dived the west coast, but on the east coast on some high current sites, you get a hot drop, which means that the boat captain lines you up with the wreck and dumps you in. You do all buddy checks on the boat so you drop in way negative and don't spend any time mucking about. At the bottom, do another buddy check.
I agree that "hot drops" are generally done when the diver is negatively buoyant. However, I don't need to be "way" negative...Maybe 6-8 lbs, which is the result of having my BC close to empty. I just point my head down, exhale, kick hard for a very short time and I am well on the way to the bottom.
I do think I agree with the context however, if you forget to turn your tank on, you are heavy and you exhale and kick down...you will have a serious problem very fast. I had an extremely experienced buddy do that... and with a heavy steel tank, no ditchable lead, little exposure protection.. if you are stupid... you better be strong.