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I saw a boat with several of them in Key West recently. The intended audience would have to primarily be tourists no doubt. My first thought about the BOB would be a flooded bubble and what that would mean to a non diver. I could see panic setting in followed by a frantic free swimming ascent unless you had one support diver per unit underwater.
Damage to the environment is certainly a concern.
Google BOB underwater adventure and you'll find some great video of the machine.
Maybe someone that's worked on one of these concessions will have some better insight.
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