Only 20 years ago the scientific community had no idea that icebergs made noise. After the last remaining chunk of the largest iceberg ever (twice the size of Delaware) began to fall apart, sounds were heard up to thousands of miles away. In fact, the ocean was documented as being much noisier as a whole. Through data analysis, scientists were able to trace the sounds back to the iceberg (and another, also melting). As more information became available (and military data became declassified) a whole range of sounds have been attributed to icebergs, from bloops to clanks, groaning and grinding (against the sea floor). Of great importance, these sounds might be able to help scientists better understand what can be expected of icebergs in the midst of climate change. Learn more at Atlas Obscura.