Originally Posted by
pasta
I doubt it. Firstly, the wreckage normally seems to provide enough information to figure out what went wrong; secondly, any such device could be incredibly valuable to any adversary who gets to it first...
Seen that marine wreck salvage appears to be profitable, as evidenced by the looting of the Canberra and of some of the Java Sea combatants, it probably would be preferable to have such a device self deploy once enough below crush depth.
That would allow a more immediate alert and speed the location of the wreck.
s