In principle but not necessarily

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In principle, but not necessarily in practice. Kaushal is doubtful because previous projects using marine life to detect submarines were not successful. German U-boats were sometimes spotted by their effect on bioluminescent plankton, which emit a bright glow when disturbed; one in WWI was allegedly even sunk thanks to the effect. But later attempts to use the effect more widely, with special sensors looking for light sources over a wide area, made little progress.

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