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.
Click here for original story, Race to the bottom of the sea – the little known heroes of the 20th century’s ‘inner space race’
Source: Phys.org