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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.