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I thought of that, but if I were making some secret military sound I would try very hard to blend in exactly like other whales, not do something unique and identifiable.

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But this is 52Hz, just around the 50Hz that a big part of the world uses as electrical standard. Some hidden generator somewhere could cause it.

I guess the hardest part to explain (in an artificial source) is how it migrates all the time, not the pitch.

Unlikely that broken electricity generator would be as loud as a whale, and survive 30years without repair.

Also, would someone choose to generate AC in a marine application?

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