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Unravel the mystery of the strange "metal" sound of the Mariana Trench

After much research, scientists figured out who issued the mysterious "metallic" sound that was recorded a few years ago in the Mariana Trench. The mysterious sound was recorded by scientists with the help of deep-water apparatus in the autumn of 2014 and spring of 2015 in the eastern Pacific in the Mariana Trench area. Sound consists of five parts, lasted about three and a half seconds, start with a low "groan" at a frequency of 38 Hz and complete "metal" finale at the frequency of 8000 Hz.

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