“The magnets worked on the Soviets with the same maddening results. The crews of several Foxtrots were driven bonkers by the noise and returned to port rather than complete their cruises.”
The had to go back because the noise made them very ‘detectable’.
I like the story of counting the “clang” of empty vodka bottles once the subs got outside of the Barents Sea. RUMINT is they could tell which captain was manning the boat based on the number of broken vodka bottles heard.