For what may be the first time, NOAA and partner scientists eavesdropped on the deepest part of the world's ocean and instead of finding a sea of silence, discovered a cacophony of sounds both natural and caused by humans.
Link: https://www.sciencedaily.com/releases/2016/03/160302135601.htm
Link: https://www.sciencedaily.com/releases/2016/03/160302135601.htm