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But work done in Russia, whose navy has long been interested in alternatives to sonar, suggests the Debye effect can be turned into something quite potent.

That suggests that a well-tuned Debye detector might be able to pick up a trail from several kilometres back and follow it to find the submarine.

Thanks to something called the Debye effect, it might be possible to hunt submarines using the magnetic signatures of their wakes.

The Debye effect has been known since 1933, but its effects were thought to be tiny.

Cornell's Peter Debye, 68, Nobel Prize-winning chemist and physicist, author of the Debye theory of the specific heat of solids.