Hello,
Often it takes time to positively identify an underwater contact as biological, and you may prefer to engage it immediately and waste a weapon rather than wait and if it is an enemy possibly lose one or more ships.
Navies frequently do this in RL combat (or even just crisis) situations. For example the British expeditionary force in the Falklands wasted almost all its ASW ordnance on contacts that were never positively identified as subs, and many of them turned out to be biologics or false contacts.
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