I believe in the book version of the Hunt for Red October by Tom Clancy, they mention that the Soviets did something similar but using a magnetometer.
Super cool to see the newest versions of this are going from sci-fi to fact.
I believe in the book version of the Hunt for Red October by Tom Clancy, they mention that the Soviets did something similar but using a magnetometer.
Super cool to see the newest versions of this are going from sci-fi to fact.