wreck penetration - the C-53 in Cozumel.... I thought it would be a problem for some people also but really it is not. All boat diving in Cozumel is lead by a DM. The DM knows the wreck inside out and every dive shop uses the same path through the wreck. The day we went with SCC, we were divided into 2 groups of 4 divers per DM. There is no reason that it would be unsafe in such a small group. Other dive shops might do it with more divers, but since it was prepped for divers with lots of exit points, I still think it is a safe wreck for even beginners.robin