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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]
The Xiaozhai Tiankeng has been well known to local people since ancient times. Xiaozhai is the name of an abandoned village nearby and means "little village", and "Tiankeng" means Heavenly Pit, a unique regional name for sinkholes in China.
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"
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 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).
When life started to form around 4 billion years ago, Earth was oxygen-free. Then the advent of photosynthesis came about, which was great for life on Earth but not so great for Lang's research.
The project drilled 2 different holes, first a pilot hole then the main hole. The pilot hole (KTB Vorbohrung, KTB-VB) was spudded on September 22, 1987, and was finished on April 4, 1989, having reached 4,000 m (13,000 feet). The main hole (KTB Hauptbohrung, KTB-HB) was spudded on October 6, 1990, about 200 m (660 feet) away from the pilot hole.