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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]
Deep Hole or Deephole may refer to: Places in the United States. Deephole, Kentucky, an unincorporated community in Lawrence County; Deep Hole, Nevada, a ghost town;
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."
This list of deepest mines includes operational and non-operational mines that are at least 2,224 m (7,297 ft), which is the depth of Krubera Cave, the deepest known natural cave in the world.
Deep hole drilling also differs from normal drilling in that, depending on the drilling process and the drilling diameter, cooling lubricant must be pumped to the cutting edges in large quantities and under high pressure. This ensures good cooling and at the same time good lubrication of the contact areas between the workpiece and the cutting ...
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An intricate maze of limestone with many holes where material has dissolved away. [1] Boulder choke. Main article: Boulder choke. A collection of large rocks or rubble that obstructs the passage of a cave or mine. In order to progress through passages, cavers often need to negotiate or clear boulder chokes. Buffoon
Chikyū (ちきゅう) is a Japanese scientific drilling ship built for the Integrated Ocean Drilling Program (IODP). The vessel is designed to ultimately drill 7 km (4.3 miles) beneath the seabed, [needs update] where the Earth's crust is much thinner, and into the Earth's mantle, deeper than any other hole drilled in the ocean thus far.