The hydrophones of German Alfred-Wegener-Institut recorded an iceberg crashing into the ice shelf close to the Neumayer III station in Antarctica on 11th Feb (German report about it here). The incident went unnoticed by the crew on the station even though the crash caused a 2 km crack in the ice and destroyed a supply road. It was a German scientist in Bremerhaven who monitored the audio live stream from the Palaoa underwater microphones to figure that something was wrong. He heard a loud growl from the hydrophones and informed the staff at the station. An excerpt of the collision can be heard on this German news site. There are several other underwater noises that occasionally occur in Antarctica, some are collected on this site of the Alfred-Wegener-Institut. And you can still listen live to the antarctic underwater world at home here.