Bathyscaphe Trieste
On 23 January 1960, she reached the ocean floor in the Challenger Deep (the deepest southern part of the Mariana Trench), carrying Jacques Piccard and Don Walsh. This was the first time a vessel, manned or unmanned, had reached the deepest known point of the Earth's oceans. The onboard systems indicated a depth of , although this was revised later to ; fairly recently, more accurate measurements have found Challenger Deep to be between and deep.
Boybuloq Cave
Expeditions resumed in 2007 and a 25-man joint Russian-French-Swiss series of expeditions was carried out from 2018. One key focus of the expeditions, which will continue in 2019, was to search for a connection to the nearby Vishnevsky Cave, the second deepest cave in the area. The 2018 expeditions mapped more than of new passages in the caves and discovered several promising leads for new explorations. A series of dinosaur footprints were also discovered near the Boybuloq Cave entrance by a team from the Yekaterinburg Caving Club and explorations of the Vishnevsky Cave reached a new depth of .