Earth Observatory SG 在 Twitter 上："At just nine inches in diameter, the Kola Superdeep Borehole is the deepest hole that humans have ever dug. It took 20 years to drill to a
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Earth Shaker - #DTF The deepest man-made hole is 12.3 kilometers deep! The Kola Superdeep Borehole is just about 22.9 cm in diameter, but the Soviets were able to drill down to
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John Carlos Baez a Twitter: "The world's deepest hole! It's 12,226 meters deep and took almost 20 years to dig, but only 23 centimeters across. They dug halfway through the Earth's crust,
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/5a/ef/5aeff71d-cc24-4de7-bd3b-158e0383e365/screen_shot_2015-02-18_at_21916_pmweb.jpg "Ask Smithsonian: What's the Deepest Hole Ever Dug? | At the Smithsonian| Smithsonian Magazine")