Source: The Conversation
Author: Jon Copley
On January 23 1960, Jacques Piccard and Don Walsh climbed into an undersea craft called Trieste and dived nearly 11 kilometres to the deepest point in the ocean – the Challenger Deep of the Mariana Trench in the Pacific Ocean.
Down there, no sunlight can reach and the water is only ever a few degrees above freezing. The water pressure outside the walls of their vessel was 1,000 times greater than at the surface, but Piccard and Walsh overcame these conditions to enter history as the first Challenger Deep voyagers
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