And until I feel comfortable that some jackass isn't going to move the beginning of the line to another cenote I'll be happy diving Florida caves.There is an active cat and mouse game going on in Mexico over lines and arrows that is a continuation of the nonsense which has been going on for the last decade.
From what I can garner, Mexican caves aren't too safe without a guide, which to me means they aren't safe.
The Grand Traverse in Peacock is a great example. The first leg is an 1800' swim to Challenge Sink. No flow, piece of cake to do on back gas. Peacock is arrow'ed every 100', so halfway in, the direction changes. It's an issue on the first half of your first dive, but once you make it to the surface in Challenge you've verified an exit. Even if there's an event on your way out, if you haven't made it more then halfway back you just turn around and get out at Challenge. You build your knowledge of the system so that when you finally do the whole thing, you already know all the cave.