Scientists reveal truth about 'alien song' coming from Mariana Trench

The Mariana Trench is one of the most mysterious places on Earth.

Measuring almost seven miles (37,000ft) deep, the trench sits on the floor of the Pacific Ocean and is so difficult to reach that just a handful of people have ventured down there.

So it's no surprise that unusual sounds coming from the Mariana Trench sparked fears of an invasion when they were

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