Depressingly common. I remember one dive (sort of rec-tec, as are most dives in Britain) where there was a honking current, and two idiots had pulled the float at the top of the ascent line down to 20 metres - that's 70 feet. Just as in the scenario above they didn't seem to know what to do about it.
It's a pity we can't get the "survival of the fittest" law rigidly applied. Then we'd gradually get rid of these divers (!).
Its interesting to note in the post below, that most of the students were some level of instructor trying to improve their skills. Any new instructors should take careful heed of ScubaDadMiami's remarks. That instructor's card gives no special dispensation from the laws of physics. You are just as vulnerable as any beginner to making potentially fatal errors on a dive gone bad.
He makes one very important point that bears repeating..."For those of you that are instructors, you place yourselves in this same risk position everytime that you teach more than one student per class without a one-to-one student-teacher ratio."
Is a one to one ratio practical? No. It's cost prohibitive. Let's face it, when you pay your fee for a class in this sport, you accept certain risks, you take your chances with everyone else. The certifying agencies feel a one to six ratio is an acceptable risk. If you don't want that risk, then be prepared to pay a sizeable premium for a "private" class, one on one. Most students can't afford that.
I've encountered multi-student "events" a few times. Most of us have. Consider, an OW class, after the required skill exercises, a required and simple dive tour of the surrounding area near the platform. Hey, six students, three very promising buddy pairs...what could possibly go wrong that I wasn't trained and experienced enough to handle?
I watched in complete disbelief, and helplessness, as my class followed me into a totally unexpected wall of "black water".
Everything, and everybody, disappeared in two seconds. Being in 30 feet of fresh water, with dim and limited viz to begin with, there was no warning. Two kick cycles and everything went completely black. My imagination went wild as I envisioned panic stricken divers shooting to the surface, getting lost, getting disoriented, oh god....that was terrible! I grabbed the two students immediately behind me, actually they swam right into me, but the other four people were gone gone gone! I got my two to the surface, and back down I went. Even my HID dive light couldn't penetrate the muck...five minutes of complete terror. However, when I surfaced, everyone had made it up safely, and followed correct ascent procedures.
Was a mistake made? Not per agency policies and procedures. I was within specified limits, conditions were as good as they ever were in fresh water, at 30 feet, dim, cold, murky. And the students needed to go to 40 feet for basic OW certification.
Next time I made sure at least one DM, and two if possible, was present at each class. For tours, a pro in lead, one midway if possible, one, for sure, trailing. A lesson hard learned, and one not normally taught. Like many instructors, I thought I was in complete control...then I learned we are never in complete control. We just think we are, until nature scares the living Sh..t out of us! The certifying agency can't foresee every possible contingency you will encounter, but enough teaching experience certainly will!
It dosen't have to be anyone's fault...or anybody's mistake...its just the nature of Nature! Steve Irwin is a tragic, but classic example...sometimes, underwater, things suddenly go terribly wrong, period. If Steve had been two inches over, in any direction, left, right, up, down...it could have been a survivable event, and remarkable footage for his shows, which I always watched.
Instead, his last minute on this earth was educational to all divers about the unpredictability of the world we live in, and swim under.
"Ceph"
Edited by Cephalopod, 06 September 2006 - 10:38 PM.
"The most dangerous creature you will encounter in any ocean, and the only one truly worth worrying about, is yourself!" H. E. Potter, General Public Nuisance, circa 2005