These are all good answers by the way thank you. Isn't there like an "emergency transponder beacon" or something (like aircraft have?) that ships and submersibles must have? Why can't this be used?
That’s what the EPIRB is… problem is it has to reach the surface to broadcast; they’re designed for finding floating vessels / life boats, not submerged objects (in this case, tombs). To be useful it would need to be spooled out on a VERY long line that you could follow back down. In this case that means the EPIRB would need to be buoyant enough to float both itself and 4000+ meters of heavy line … which would be great, although also a threat to navigation.
Isn't there a way to use the charge conductivity of water to send a signal--like "electrolysis radio"? Alternately it seems a constellation of cheap radio beacons / high powered IR reflectors, that can float to the surface at a constant rate in event of emergency. So you basically end up with a 2D surface trail of reflectors laid over time since the incident. That should be somewhat helpful to pin down a search area, I would imagine, without relying on a single one, or having a long spool line. But I don't know for sure, just spitballing. Those poor people :(
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