Advisor of Submersible Company That Trapped Its Passengers Condemns Goverment Interference

[Effete Snob]

23. not sure what you mean

Radio waves don't travel in seawater.

I'm not familiar with issues involving acoustic devices at the sort of pressures involved at the depth in question.

For example:

https://en.wikipedia.org/wiki/Underwater_locator_beacon


A 37.5 kHz (160.5 dB re 1 μPa) pinger can be detectable 1–2 kilometres (0.62–1.24 mi) from the surface in normal conditions and 4–5 kilometres (2.5–3.1 mi) under ideal conditions.

So, the depth of the Titanic is outside of the range of "normal conditions" under which the beacon described in that Wikipedia article operates.

Do you have a specific technology in mind?