The 52 Hz call is identified in Navy hydrophone data

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William Watkins of the Woods Hole Oceanographic Institution identifies a call at 52 Hz in US Navy hydrophone recordings - far higher than the calls of the great baleen whales around it. The same caller is subsequently tracked seasonally across the North Pacific, from off California toward the Aleutians, over hundreds and sometimes thousands of kilometres between recordings. It is the first demonstration that Cold War submarine-tracking infrastructure could follow an individual large whale across an ocean basin.

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