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A comment on China's new submarine engine. Parent comment

Re:China's new submarine engine by coredog64 on Sunday June 04, 2017 @12:06PM (#14482177)
Magnetometers are already used to detect submarines [0]. Maybe it isn't so much about the flux from the motor being detectable, but it's additional interference with the Earth's magnetic field.

[0] https://en.m.wikipedia.org/wiki/Magnetic_anomaly_detector

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Re:China's new submarine engine by simonh on Sunday June 04, 2017 @12:24PM (#14482237)
They're used to detect the hull, which is why Titanium is valuable for use in military submarine hulls as its non-magnetic. Fun fact, much of the Titanium used in US submarine hulls was sourced from - er - the USSR. The needed the foreign exchange more than it was worth denying the Titanium to the US.
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Re:China's new submarine engine by madengr on Sunday June 04, 2017 @05:48PM (#14483733)
Read a book recently called "Big Ear" by John Krauss. He talks about degaussing ships in WWII since Germany was using magnetic mines.
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