The Mariana Trench is deeper than Everest is tall.

Wacky WorldOceans

The Challenger Deep is about 10,900 m deep. Mount Everest, at 8,849 m, would disappear with over 2 km of water above its peak.

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More than 80% of the ocean has never been mapped in detail.Some jellyfish can age backwards.The deepest point reached by a diver on one breath is over 200 m.