Am I right in thinking it could return to the surface then run out of Oxygen, before being found? i.e. they are locked in?
Seems unlikely that it wouldn't have some sort of beacon (EPIRB?) that would make locating it really easy if it was at the surface and intact.
@jellybaby started
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Am I right in thinking it could return to the surface then run out of Oxygen, before being found? i.e. they are locked in?