Why the ocean is getting louder

What the world sounds like underwater.

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We often think of the ocean as a quiet, peaceful place, filled with animals that don't make much noise. So when I went diving in the ocean for the first time, I was surprised at how rich the soundscape around me was: you could hear fish nibbling on coral and squid swimming past you. But more than anything, you could almost always hear the hum of a boat engine. It's part of a big problem in the ocean right now. Ship traffic noise has doubled every decade since the 1960s — and it's wreaking havoc on marine life.

This video was made in collaboration with Twenty Thousand Hertz, a podcast that dives deep into all kinds of stories about sound. Everything from "who's the person behind the voice on your phone," to "what do other planets sound like to our ears?"

To hear more stories like this, subscribe at http://applepodcasts.com/20k, or learn more at http://www.20k.org

Marine life photographs courtesy of NOAA, STRI Office of Bioinformatics, and Richard Bejarano.

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