Publisher: Christian Wolff
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SOSUS hydrophones, laid on the seabed and connected by underwater cables, were used, beginning in the 1950s, by the . Navy to track movement of Soviet submarines during the Cold War along a line from Greenland , Iceland and the United Kingdom known as the GIUK gap .  These are capable of clearly recording extremely low frequency infrasound , including many unexplained ocean sounds .
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A hydrophone (Ancient Greek ὕδωρ = water and φωνή = sound) is a microphone designed to be used underwater for recording or listening to underwater ...