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  2. Kola Superdeep Borehole - Wikipedia

    en.wikipedia.org/wiki/Kola_Superdeep_Borehole

    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]

  3. Bertha Rogers Borehole - Wikipedia

    en.wikipedia.org/wiki/Bertha_Rogers_Borehole

    The Bertha Rogers Borehole is a former natural gas well in Burns Flat, Dill City, Oklahoma, US.Today plugged and abandoned, it was originally drilled by the Lone Star Producing Company as its oil-exploratory hole number 1–27 between October 25, 1972 and April 13, 1974, reaching a then world record terminal depth of 31,441 feet (5.9547 mi; 9,583 m).

  4. Xiaozhai Tiankeng - Wikipedia

    en.wikipedia.org/wiki/Xiaozhai_Tiankeng

    The Xiaozhai Tiankeng has been well known to local people since ancient times. Xiaozhai is the name of an abandoned village nearby and means "little village", and "Tiankeng" means Heavenly Pit, a unique regional name for sinkholes in China. A 2,800-step staircase has been constructed in order to facilitate tourism. [2]

  5. What's inside the world's deepest hole?

    www.aol.com/news/whats-inside-worlds-deepest...

    As the race in space was winding down, soviet scientists turned inwards. You'd never guess that this is the site of one of their great achievements. This hard-to-find rusty cap in the ruins of a ...

  6. How Drilling the World’s Deepest Holes Could Give Us ...

    www.aol.com/lifestyle/drilling-world-deepest...

    The World’s Deepest Holes Can Fight Climate Change ThomasVogel - Getty Images. ... Currently, the world’s deepest drilled hole is the Kola Superdeep Borehole in Russia near Norway.

  7. China is drilling some of the world’s deepest holes in hunt ...

    www.aol.com/news/china-drilling-world-deepest...

    Chinese engineers on Thursday broke ground on a new super deep borehole that will burrow far into the Earth’s crust as the country steps up its search for natural resources hidden tens of ...

  8. Category:Deepest boreholes - Wikipedia

    en.wikipedia.org/wiki/Category:Deepest_boreholes

    the deepest boreholes (Core drill, for geological exploration), and; the longest boreholes ( Extended Reach Drilling , for oil production). Pages in category "Deepest boreholes"

  9. Krubera Cave - Wikipedia

    en.wikipedia.org/wiki/Krubera_Cave

    The system became the deepest in the world with its overall vertical range of about 2,500 m (8,200 ft) (measuring to the borehole water-bearing horizon) or even 2,700 m (8,900 ft) (measuring to the deepest reported submarine discharge points).