Whale heard from Mariana Trench by Andrew Freedman published on 2016-03-03T21:49:58Z The sound of a baleen whale vocalizing just before, and during, a magnitude 5 earthquake. This was recorded by a hydrophone in the Mariana Trench, at about 36,000 feet deep, in July 2015. Credit: NOAA/Oregon State University/Coast Guard. Genre Science