Bathyscaphe Trieste
Trieste is a Swiss-designed, Italian-built deep-diving research bathyscaphe, which with its crew of two reached a record maximum depth of about , in the deepest known part of the Earth's oceans, the Challenger Deep, in the Mariana Trench near Guam in the Pacific. On 23 January 1960, Jacques Piccard (son of the boat's designer Auguste Piccard) and US Navy Lieutenant Don Walsh achieved the goal of Project Nekton.
Henry Morshead
In 1913 Frederick Bailey, an intelligence officer with the Indian Army, invited Morshead to be the surveyor in an expedition to explore the Yarlung Tsangpo Grand Canyon (Tsangpo Gorge), now known to be the world's deepest gorge.
Bailey and Morshead explored from the south with Morshead surveying the entire route and calculating the results as they went so as not to delay progress. By ascending the Dibang River they crossed the Himalayan watershed into Tibet to reach the Dihang River and ascending the Gorge.