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Do you know that in 2003 when an American research crew was exploring Mariana trench with their unmanned robotic submarine then suddenly they heard some voices, and when they took out the submarine they found that their sting metal cables were damaged to such an extent that no marine creature can do that. Except for Megalodon. But how is that possible? Do they still exist? And if this was the reason that nowadays nobody wants to explore the Mariana trench? Is there something deeper inside the dark side of the Mariana trench? Let's find out in today's video.

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