It's more than 50 years since the only successful manned mission to the deepest point on the planet - the Mariana Trench. Now a new wave of explorers is racing to be the next to go beyond the abyss.
It's more than 50 years since the only successful manned mission to the deepest point on the planet - the Mariana Trench. Now a new wave of explorers is racing to be the next to go beyond the abyss.
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