When hey spot me yes. And when some fish impacts a target, also yes. But for some reason, I've not seen them start helming when one of my fishes go off somewhat premature.
I would think that was a dead give-away. But the IJN and merchant fleet seem to think great fountains of water followed by a big boom is just some natural occuring event.
"Oh don't worry about that. Cadets these days, getting all excited over some whale that had a methane problem. Carry on, nothing to see here!"
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