History's Mysteries June 13, 2019

Underwater espionage: The surprising history of marine mammals and military service

By Daniel Marzullo

A marine mammals undergoes transport in the Persian Gulf.

These units are conducting deep and shallow water mine countermeasure operations to clear shipping lanes for humanitarian relief. (Photo by Brien Aho/U.S. Navy/Getty Images).

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Underwater espionage: The surprising history of marine mammals and military service

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