81. In game voice, possible detection of voices via hydrophones (sum of all amplitudes of players simultaenously speaking), if voice amplitudes rais to "normal" conversational levels. Forces players to speak more softly when in proximity to escorts, and to avoid many speaking at the same time.
Similarly, add the "clack" of the contactor to the detectable sounds on escort hydrophones. Compels several behaviours to avoid detection: use of creep-mode, no changes of battery configuration when near escorts. The sound of the contactor is fairly loud, so I'd put it a roughly the detection risk of employing the bilge-pump underwater.
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