I'm pretty sure that GPS is useless under water, as is radio if the navy's use of very low frequency / long wavelength radio signals to communicate with our submarines still applies.
My guess is that the commercial/tourist submarine industry is not regulated to any international standard, so there probably isn't any requirements for black boxes, pingers, or emergency locators.....
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2015 BMW i3 BEV, Giga World (Lodge interior), Tech/Driving Assist Packages, 30K miles
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