The crew of the Sequoia and NOAA scientists deploy the hydrophone in an attempt to listen to ambient sound in the deepest part of the Challenger Deep

Petty Officer 3rd Class Jonathan Gonzales, a boatswain's mate aboard the U.S. Coast Guard Cutter Sequoia, homeported in Apra Harbor, Guam, prepares to throw a grappling hook to retrieve a NOAA hydrophone from Challenger Deep near the Federated States of Micronesia, November 3, 2015. Image courtesy of U.S. Coast Guard Petty Officer 3rd Class Dylan Hall.

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Ambient Sound at Full Ocean Depth: Eavesdropping on the Challenger Deep