In Our Time: The Mariana Trench

In 1875 in the western Pacific, the crew of HMS Challenger discovered The Mariana Trench, which turned out to be deeper than Everest is high, by two kilometres. Trenches like Mariana form when one tectonic plate slips under another and heads down and there are around 50 of them globally. While at one time some thought it was too dark and deep for life there and others wildly imagined monsters, the truth has turned out to be much more surprising. Misha Glenny and guests discuss the life and future of the world's deepest ocean trench