Where's the adventure in all that? More fun to imagine that the boat might not be there when you surface and you'll have to rely on your own awesomeness to survive and find a way out. Or you could just pack a sat phone in a dry bag.
So many options...
The Navy already has autonomous boats running around. They've always had a human onboard until recently
So you're saying paint it like a naval boat? Problem solved! Great idea!
I guess it would be an app. And we all know cell phones never malfunction.
Be handy for the narcotraficantes though. Hack a diver's boat and hide contraband onboard when the owner submerges. If it makes it back to shore undetected, you pick it up. If the owner gets busted, it's their problem.
Have I sufficiently rained on your parade? I'm sure I can think of some more.
No you have not....I believe that begins an epic game of hide and go seek...and one hell of a party with all the Baywatch babes!!