pilot fish
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Good idea
I would think a passive device with some programmed triggering criteria would work best. The devices I've seen on the web all last for months if they aren't triggered, and then can transmit constantly for a month or more.
Basically, there would be no noise unless a diver caused at least one of the triggering conditions to be met. I think it would make the most sense if the criteria could be set after the factory, or perhaps have several different models for different situations. Recreational criteria might be something like this:
1) 3 hours after being submerged
2) Below 250 feet
3) No air and still submerged
Obviously, programmability and or different versions would be necessary for tech diving applications.