The Icebergs Are Talking. We Just Have To Listen.

That means Deane and the other researchers can tell how much ice is breaking off, and ultimately, how much it's contributing to global sea-level rise. By the sounds they make, Deane says, the glaciers may just reveal their secrets.
http://www.npr.org/2015/02/01/382980142/the-icebergs-are-talking-we-just-have-to-listen