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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]
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]
The British sinologist and historian Michael Loewe states that borehole sites could reach as deep as 600 metres (2,000 ft). [3] K.S. Tom describes the drilling process: "The Chinese method of deep drilling was accomplished by a team of men jumping on and off a beam to impact the drilling bit while the boring tool was rotated by buffalo and oxen."
A borehole 440 feet deep is still overflowing under natural water pressure inside. [3] In addition to Hunger Hill, another, larger pumping station was constructed at the same time near Chander Hill, called Whispering Well.
Download QR code; Print/export Download as PDF; ... A borehole is a narrow shaft bored in the ground, ... Deep borehole disposal; E.
A drilling rig is used to create a borehole or well (also called a wellbore) in the earth's sub-surface, for example in order to extract natural resources such as gas or oil. During such drilling, data is acquired from the drilling rig sensors for a range of purposes such as: decision-support to monitor and manage the smooth operation of ...
Hubble Deep Field: 1995: 2.6′x2.6′ 342 Hubble Deep Field South: 1998: 5.3²′ 995 Chandra Deep Field South: 1999–2000: 16′ across: 11 Hubble Ultra-Deep Field: 2003–2004: 2.4′x2.4′ 808 Extended Groth Strip: 2004–2005: 70′x10′ over 500 Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) 2011: ESO's VLT ...