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Ken, >>You're diving in the most beautiful cenotes in the world. You're looking at everything around you with your jaw hanging dropping almost so much you're loosing your regulator. You're following the line in. Some asshole has a blind T that you miss.<< Some asshole? Let's back up here, you weren't paying attention to the line, you were more interested in the tourist thing even though you knew you were in a cave you aren't familiar with so you missed the T completely! Now I agree that in a surveyed cave there should not be _any_ Ts and I generally agree that many lines are placed too far back in the system. In fact, I think that all caves should be marked and lined similarly so that every time you dive a new cave you don't have some new variation on the basic lining theme. But there are some things you can't prevent and even with a well-marked system there will be places where an inattentive diver can screw himself beyond redemption! If, following your example, the diver goes to the end of that line or realizes (he has paid a _little_ attention to where he is, right?) that this _isn't_ his line, then I assume he has air-planned for this and will turn, get on the correct line (he didn't project himself into a new system, right? <g>) and exit a little lower on air, but safe. What I am assuming you are talking about, though, is the accident at Maya Blue, I think it was, where two divers got lost and _presumably_ came to the end of the wrong line and couldn't find the exit, then returned up that line and never found the right line out. Divers do have responsibility to know what they are doing regardless of the system. I agree that the lines in some caves are poorly marked and laid out, but, especially in the Yucatan, divers are going there on a short vacation and don't want to take the time to learn the front end before doing the back. And there will always be a price to be paid for that--regardless of lines. That's why it's wise to use the guides who are there for that purpose and if you can't keep your guides' butt in view in 100+ vis, then you _are_ in trouble! JoeL
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