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 2nd Class John Thompson, a boatswain's mate aboard the Coast Guard Cutter Sequoia, and Dr. Joseph Haxel, oceanographer with NOAA and Oregon State University, prepare special floats used to deploy a hydrophone in Challenger Deep near the Federated States of Micronesia, January 11, 2015. The crew of the Sequoia and NOAA scientists deployed the hydrophone in an attempt to listen to ambient sound in the deepest part of the Challenger Deep. Image courtesy of U.S. Coast Guard Petty Officer 2nd Class Tara Molle.

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