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The 12,262-metre (40,230 ft) deep Kola Superdeep Borehole has been the world's deepest borehole since 1979. [ 1 ] [ 28 ] It was also the longest borehole in the world from 1979 to 2008.
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.
For many years, the world's longest borehole was the Kola Superdeep Borehole in Russia. From 2011 until August 2012 the record was held by the 12,345-metre (40,502 ft) long Sakhalin-I Odoptu OP-11 Well, offshore the Russian island Sakhalin. [11] The Chayvo Z-44 extended-reach well took the title of the world's longest borehole on 27 August 2012 ...
Currently, the world’s deepest drilled hole is the Kola Superdeep Borehole in Russia near Norway. ... crystalline rock deep down that conventional drilling struggles with,” Houde says. ...
Borehole drilling has a long history. Han dynasty China (202 BC – 220 AD) used deep borehole drilling for mining and other projects. Chinese borehole sites could reach as deep as 600 m (2,000 ft). [1]
Chinese engineers on Thursday broke ground on a new super deep borehole that will burrow far into the Earth’s crust as the country steps up its search for natural resources hidden tens of ...
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The drill team created a deep borehole in the seafloor. IODP JRSO It's not the deepest hole ever drilled, but it is the deepest sample of this kind of ocean rock researchers have ever obtained ...