AFAIK it's perfectly safe to use while submerged. I would lament the game being locked to anything lower than 1024, sometimes when I'm already in the desired/ordered AO (i.e. not transiting) but there's a bad storm, submerging and TCing is the best way to get it over with. Unlike doing it while surfaced, I've never been dangerously surprised by hydrophone contacts at high TC.
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