10 deepest rivers in the world ranked: From the Congo’s 250m depths to the Mississippi River

Rivers create landforms, foster biodiversity, and provide sustenance to humanity; however, little attention is paid to their ...
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Deep enough to swallow skyscrapers and filled with deadly toxic gases, it plunges so far into Earth even robots have never reached the bottom

Extreme depths, low visibility, acid water and unbreathable surface air: welcome to the world’s deepest known freshwater cave ...