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The 23-centimetre-diameter (9 in) boreholes were drilled by branching from a central hole. [1] The deepest reached 12,262 metres (40,230 ft; 7.619 mi) in 1989, the deepest human-made hole on Earth, and remains so as of 2024 . In terms of true vertical depth, it remains the deepest borehole in the world.
Oct 20, 2023 · The Kola Superdeep Borehole in Russia is the deepest hole in the world. It's deeper than the Mariana Trench and deeper than Mt. Everest is tall. Why did the Russians dig this deep, and why did they stop?
Story by Noah Smith. • 1w • 2 min read. The Kola Superdeep Borehole, once a potent symbol of Cold War-era scientific ambition, remains an object of fascination as the deepest manmade hole on...
Feb 22, 2020 · Known as the Kola Superdeep Borehole, the deepest hole ever dug reaches approximately 7.5 miles below the Earth’s surface (or 12,262 meters), a depth that took about 20 years to...
Nov 10, 2009 · In actuality, the Kola Superdeep Borehole consists of several holes branching from one central hole. The deepest hole is called “SG-3,” and though just nine inches in diameter, it extends...
During the Cold War, the US and Soviets both created ambitious projects to drill deeper than ever before.
Jun 12, 2021 · From 1970 to 1994, in the western Russian province of Murmansk, the Kola Superdeep Borehole drilled to the deepest point ever reached below Earth’s surface. Housed in this 27-story superstructure, it found high temperatures, gases, fractures, water, and Precambrian fossils, and changed some long-standing scientific hypotheses.
