In the early 1990s, the Navy began letting civilian researchers borrow its $15 billion underwater hydrophone system, which was formerly used to eavesdrop on Soviet subs. Geologists listened in on ...

Searchers could even use hydrophone data - sound picked up by underwater microphones. Ocean Infinity will receive a whopping £55million from the Malaysian government - if it finds new wreckage of ...

America’s underwater espionage program was launched in the 1950s with a submarine detection system known as the Sound Surveillance System. That consisted of so-called hydrophone cables - a type ...