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> become too stupid to save yourself.

You probably weren't too smart to begin with to go to 50m on compressed air, and without a seafloor at that.

I haven't been to the blue hole, but I can easily see nonchalant guides leading people to ignore any misgivings they had from what little training they may have had years ago.

I can see someone with a 30m certification going to 40-45m. But anything below that ought to be a huge "no" for anyone who's done the basic deep dive training, in fact you should be running away as fast as you can.

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