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>2. Has anyone heard of ANY instance of any problem using regular (non O2 >cleaned) scuba equipment. I heard the following from a friend -- a non-clean regulator was put on an O2 cylinder, and when turned on a sharp, though not particularly loud, crack was heard. On inspection, the first stage of the regulator was found to have a hairline crack. I can't personally verify this however. I've been reading for a couple of weeks now, so I guess it's time to say what I do. My open water diving is mostly fairly conventional (a consequence of being in a University club). The "real" diving is cave diving --- I was a caver long before I was a diver, and learned to dive for that specific reason (the open water was a bonus). UK cave diving is not generally deep, or particularly long (with a few exceptions) --- our problems are poor visibility, constricted passages, and carrying through the dry cave. Making any exploratory progress nowadays generally requires some, er, "civil engineering"... Finally,... I have a question. I'm currently involved in diving at the end of a cave which involves a 4km carry in, mostly arkward passage. The long carry, together with the fact that diving conditions are unpredictable, means that full cylinders have tended to accumulate at the end of the cave. I've taken in fresh cylinders, but a couple of the other divers are looking longingly at these other cylinders, just lying there. The trouble is, they've been there for up to six years... We are in a position to check the O2 content, and pressure, and can compute from these a reasonable estimate of the amount of corrosion that has occured. Also, I guess we could running some of the air through some white cloth to see if any rust emerges. Is there anything else that may have happened? Any other simple checks that can be done? Thanks in advance. Dr. Neal Harman Department of Computer Science University College of Swansea Singleton Park Swansea SA2 8PP TEL: +44 792 295394 FAX: +44 792 295708
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