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The Kola Superdeep Borehole SG-3 (Russian: Кольская сверхглубокая скважина СГ-3, romanized: Kol'skaya sverkhglubokaya skvazhina SG-3) is the deepest human-made hole on Earth (since 1979), which attained maximum true vertical depth of 12,262 metres (40,230 ft; 7.619 mi) in 1989. [1]
Hranice Abyss. Hranice Abyss (Czech: Hranická propast) is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice, Czech Republic.The greatest confirmed depth is 519.5 m (1,704 ft), of which 450 m (1,476 ft) is underwater.
This list of deepest mines includes operational and non-operational mines that are at least 2,212 m (7,257 ft), which is the depth of Veryovkina Cave, the deepest known natural cave in the world. The depth measurements in this list represent the difference in elevation from the entrance of the mine to the deepest excavated point.
Scientists using an ocean drilling vessel have dug the deepest hole ever in rock from Earth's mantle - penetrating 4,160 feet (1,268 meters) below the Atlantic seabed - and obtained a large sample ...
The Xiaozhai Tiankeng is 626 meters (2,054 feet) long, 537 meters (1,762 feet) wide, and between 511 and 662 meters (1,677 and 2,172 ft) deep, with vertical walls. Its volume is 119,349,000 m³ and the area of its opening is 274,000 m 2. This material has been dissolved and carried away by the river.
The deepest individual pitch (vertical drop) within a cave is 603 m (1,978 ft) in Vrtoglavica Cave in Slovenia. The second deepest pitch is Patkov Gušt at 553 m (1,814 ft) in the Velebit mountain, Croatia. Lamb Leer, Somerset, England, was entered by a 25 m (82 ft) pitch as early as the 17th century.
The deepest blue hole in the world is the Taam Ja' Blue Hole in Chetumal Bay, which was found to have a depth of more than 420 metres (1,380 ft) in 2024. [ 3 ] The second deepest is the Dragon Hole , or Longdong, in the South China Sea at 300.89 metres (987 ft) deep, [ 4 ] while the third deepest blue hole in the world is Dean's Blue Hole at ...
The cosmic ray rate in the laboratory is under 0.2 muons/m 2 /day, [5] placing the lab at a depth of 6720 m.w.e. [6]: 2 and making it the best-shielded underground laboratory in the world. [ 7 ] : 17 The actual depth of the laboratory is 2,400 m (7,900 ft), yet there is horizontal access so equipment may be brought in by truck.