He's not entirely wrong. Once you get down to a certain depth you don't need to worry about life vests anymore.

Also, it's unlikely anyone would ever certify his innovative pressurized coffin. There are several volumes of good reasons that the only manned expeditions that go down that far are financed by national governments.

Boldly going where several people have gone before the stare out a 10" porthole at a rusted pile of junk in the dark.