What secrets lie hidden in the deepest, darkest place on Earth? The Mariana Trench is a hostile world of crushing pressure and freezing darkness, once believed to be completely devoid of life. In this video, we plunge into the abyss to witness the titanic geological forces that created this chasm and relive the harrowing missions of the few who dared to explore it. What bizarre creatures thrive against all odds, lurking in the darkness below?