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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]
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. The depth measurements in this list represent the difference in elevation from the entrance of the mine to the deepest excavated point.
This list of deepest caves includes the deepest known natural caves according to maximum surveyed depth as of 2024 ... This page was last edited on 27 February 2025, ...
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 ...
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Correction: August 23, 2024 — An earlier version of this story misstated how quickly the drill dug into the seabed. It took three days to get to 200 meters, then an additional 5 days to get to ...
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.
The Woodingdean Water Well is the deepest hand-dug well in the world, at 390 metres (1,280 ft) deep. It was dug to provide water for a workhouse. [1] [2] Work on the well started in 1858, and was finished four years later, on 16 March 1862. It is located just outside the Nuffield Hospital in Woodingdean, in Brighton and Hove, England, United ...