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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 Bertha Rogers Borehole is a former natural gas well in Burns Flat, Dill City, Oklahoma, US.Today plugged and abandoned, it was originally drilled by the Lone Star Producing Company as its oil-exploratory hole number 1–27 between October 25, 1972 and April 13, 1974, reaching a then world record terminal depth of 31,441 feet (5.9547 mi; 9,583 m).
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 ...
Blue Hole (Red Sea) – a submarine sinkhole around 94 m (308 feet) deep in east Sinai, a few kilometres north of Dahab, Egypt on the coast of the Red Sea. Dead Sea sinkholes; Dean's Blue Hole – the world's second deepest known salt water blue hole with an entrance below the sea level; in the Bahamas
They were rolling in the deep. Scientists have identified what could potentially be the “deepest known blue hole” in the world, extending so far down that the bottom has not yet been reached.
the deepest boreholes (Core drill, for geological exploration), and; the longest boreholes (Extended Reach Drilling, for oil production).
Called Dean’s Blue Hole (named after a Bahamian fisherman), this impressive marine formation, located in a protected bay west of Clarence Town, is the third-deepest blue hole in the world ...