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The World's Deepest Hole – Alaska Science Forum – July 1985; The Deepest Hole 20 June 2006; Kola Superdeep – Scientific research results and experiences by PhD A. Osadchikh 1984 (in Russian) Photo report on a trip to the Kola superdeep well in 2017. Many photos of the current state. (in Russian)
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.
As the race in space was winding down, soviet scientists turned inwards. You'd never guess that this is the site of one of their great achievements. This hard-to-find rusty cap in the ruins of a ...
the deepest boreholes (Core drill, for geological exploration), and; the longest boreholes ( Extended Reach Drilling , for oil production). Pages in category "Deepest boreholes"
Dragon Hole is about 100 metres (330 ft) deeper than Dean's Blue Hole in the Bahamas. There are several fresh water sinkholes on land that are deeper than Dragon Hole. These include Mexico's Zacatón (335 metres (1,099 ft)), Pozzo del Merro in Italy (392 metres (1,286 ft)) [4] [5] and Hranice abyss in the Czech Republic (404 metres (1,325 ft)).
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 ...
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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.