![Mamas A. Mamas on Twitter: "Dig yourself out of this hole ! 😳 The Kola Superdeep Borehole is result of a Russian scientific drilling project that reached 12,262 metres (40,230 ft and Mamas A. Mamas on Twitter: "Dig yourself out of this hole ! 😳 The Kola Superdeep Borehole is result of a Russian scientific drilling project that reached 12,262 metres (40,230 ft and](https://pbs.twimg.com/media/Dm_VeAoXgAEDJ2K.jpg)
Mamas A. Mamas on Twitter: "Dig yourself out of this hole ! 😳 The Kola Superdeep Borehole is result of a Russian scientific drilling project that reached 12,262 metres (40,230 ft and
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Earth Observatory of Singapore - 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
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
![Mamas A. Mamas on Twitter: "Dig yourself out of this hole ! 😳 The Kola Superdeep Borehole is result of a Russian scientific drilling project that reached 12,262 metres (40,230 ft and Mamas A. Mamas on Twitter: "Dig yourself out of this hole ! 😳 The Kola Superdeep Borehole is result of a Russian scientific drilling project that reached 12,262 metres (40,230 ft and](https://pbs.twimg.com/media/Dm_VdAwWsAYCPzb.jpg)