Sound travels at~1400-1500 m/sec in sea water (and varies with temperature, pressure (depth) and salinity). In the typical "engagment" ranges (less than say 4000 m) the lag between optical and accoustic observations wouldn't exceed 3 seconds.
Anyway the problem is that the game does not incorporate actual acoustics (I think). In the SH universe sound propagates instantly!!!!
commandosolo2009 is probably right
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- Oh God! They're all over the place! CRASH DIVE!!!
- Ehm... we can't honey. We're in the car right now.
- What?... er right... Doesn't matter! We'll give it a try anyway!
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