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  2. Kola Superdeep Borehole - Wikipedia

    en.wikipedia.org/wiki/Kola_Superdeep_Borehole

    The KTB superdeep borehole (German Continental Deep Drilling Programme, 1987–1995) at Windischeschenbach in northern Bavaria was drilled to a depth of 9,101 metres (29,859 ft), reaching temperatures of more than 260 °C (500 °F). Its ambitious measuring program used high-temperature logging tools that were upgraded specifically for KTB.

  3. 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).

  4. 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).

  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...

    By replacing conventional drill bits with millimeter wave energy, powered by a gyrotron machine, it’s possible to melt and then vaporize the rock to create many of these deep holes. It took MIT ...

  7. China is drilling new 10,000m deep hole into Earth to search ...

    www.aol.com/china-drilling-10-000m-deep...

    China is drilling a new 10,000-metre deep hole into the Earth with the hope of finding a gas reserve in its southern west Sichuan province.. This will be China’s second ultra-deep well ...

  8. Deep hole drilling - Wikipedia

    en.wikipedia.org/wiki/Deep_hole_drilling

    Important for the good surface quality is the asymmetrical design of the deep hole drilling tools. The "classical" tools for single-lip deep hole drilling, BTA deep hole drilling and ejector deep hole drilling are, with a few exceptions, designed asymmetrically and have a secondary cutting edge (circular grinding chamfer) and guide pads.

  9. Scientists obtain deepest rock sample from Earth's mantle - AOL

    www.aol.com/news/scientists-obtain-deepest-rock...

    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 ...