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.
Skelton Inlet
The Skelton Inlet is an ice-filled inlet at the terminus of the Skelton Glacier, along the western edge of the Ross Ice Shelf in Antarctica. The feature is about 16 km (10 mi) wide at the entry points between Cape Timberlake and Fishtail Point, where it is about 1500 m deep. Its deepest point is 1933 m below sea level. It was discovered by the British National Antarctic Expedition (BrNAE), 1901–04, which named this feature for Lt. Reginald W. Skelton (Royal Navy), chief engineer of the expedition's ship RRS "Discovery".