The whales heat placton or krill, the same of some fishes.
this could attract some seagulls like a fishing boat.
could be the seagulls think that the sallow u boat is a whale or there are some fishes near the hull.
the sea life some times is important for the navy,
whales are detected by sonar and some placton have a faint green light at night in the wake of a ship, that could be detected by a special light detector.
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