This is the sound of a splitting iceberg.
Like ice cubes cracking in a glass of warm soda, except louder.
Disintegrating icebergs generate significant noise pollution at the world's poles, affecting narwhals, whales and other aquatic life, according to a study published June 18 in Oceanography. And with temperatures rising at the poles due to climate change, the oceans will only get louder.
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The splitting of an iceberg over 20 minutes in the Antarctic's Southern Ocean produces enough sound energy to equal that of 214 supertankers, according to the study.
"Sound from ice breakup in the Southern Ocean can be significantly greater than anthropogenic noise sources and thus are a major contributor to the overall ocean noise budget," the authors state.
It had been assumed so far by oceanographers that the loudest noises in the oceans of the Arctic and Antarctic are generated by direct human activity, such as the sonic booms emitted by vessels exploring for oil, by shipping traffic, and sonar.