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[video=youtube;Z1iaa04rCf0]http://www.youtube.com/watch?v=Z1iaa04rCf0&feature=youtube_gdata_player[/video]
Cave Diving, a Deceptively Easy Way to DIE.
NDL diving is a relatively safe endeavor. Cave diving is not. Trusting your life in Mexican safety standards for an inherently dangerous activity? You gotta be bonkers. As the last poster noted, even if you and your DM are great, there can be others involved. Plus the risk of random equipment failure or just plain old Mother Nature throwing one of her random curves. I just don't get how people, especially on this normally hyper-judgmental forum, can be sanguine with the business of taking untrained divers into overhead environments.
fred, have you done any cenote dives? Some of them (Ponderosa) are nothing more than swimming under a shelf, with open water to one side of you. Others are more truly overhead, but none is "tight" and I cannot think of a single one where anything anyone did could blow the viz to lower than Puget Sound normal. All of them are done on thick gold line, with no branches (unless someone has tied off their reel, which is pretty obvious).
IF you stay on the line, and if you can do a 45 minute dive to 30 feet without panicking and bolting to the surface, the cenote dives are pretty darned benign. Where people have gotten into trouble is either because they cannot cope with even the simplest problem without surfacing, or because they have followed an ill-advised guide into true cave.
I am, as I think anyone who reads on the this board much knows, an EXTREMELY risk-averse diver, and extremely conservative. But I honestly don't think the cenote dives, as a general rule, are any more dangerous than taking tourists through the Cathedrals off Lanai, which is done every single day (as are the cenote dives) with a good safety record. IF the rules are followed, which is why I started this thread.