Mariana Trench is the deepest and one of the most unexplored places on Earth. The water pressure here is so immense it can instantly crush almost any living organism. Only the brave few managed to go all the way down. How did they do it, and what did they find at the bottom?  

In this episode of HOW IT WAS, we will tell you about the Challenger Deep discovery, which is the world's deepest known point, at the southern end of the Mariana Trench. You will learn about the first manned descent to the Challenger Deep by Jacques Piccard and Don Walsh and about journeys to the bottom by James Cameron and Victor Vescovo. You’ll also find out how deep-sea microorganisms and fish adapted to high pressure; and why Mariana Trench was proposed as a site for nuclear waste disposal

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