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If that is the question you want to ask, then maybe you are in the wrong forum. Cave divers are not deterred by that sign because they have the training that allows them to pass it safely. That question--and it is a very good question--is probably best asked in something like Basic Scuba or (maybe better) Advanced Scuba. It could be interesting to see how non-trained divers would react to coming across that in the back of a cavern.So dear cave divers
What kind of signs will probably make you think twice (or more) before to decide to go ahead?
What kind of shocking/preventing messages can be strong enough to make you hesitate?
The NACD (National Association of Cave Divers) also has a sign. Theirs looks like a stop sign and gives a similar message.
There are OW divers who do cavern dives in Mexico, with qualified guides, and the safety record is good. Those ‘cenote’ dives are very popular. These signs typically exist in areas where the cenote divers might encounter them at the beginning of a true cave system; a far more dangerous environment. They’re intended to keep these cenote divers from going into the wrong tunnel. My guess is that they do the job, although 99% of the OW divers in those area are with guides that (hopefully) would never take their clients into the cave zone.I am not a trained cave diver and would not go into an over head environment, so the Wall poster is aimed at my type of diver, by genuine trained cave divers who don't want a lot of dead bodies clogging up their caves and drawing "Hairy Eyeball" type attention of authorities.