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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. Borehole - Wikipedia

    en.wikipedia.org/wiki/Borehole

    For many years, the world's longest borehole was the Kola Superdeep Borehole in Russia. From 2011 until August 2012 the record was held by the 12,345-metre (40,502 ft) long Sakhalin-I Odoptu OP-11 Well, offshore the Russian island Sakhalin. [11] The Chayvo Z-44 extended-reach well took the title of the world's longest borehole on 27 August 2012 ...

  4. Boring (earth) - Wikipedia

    en.wikipedia.org/wiki/Boring_(earth)

    Borehole drilling has a long history. Han dynasty China (202 BC – 220 AD) used deep borehole drilling for mining and other projects. Chinese borehole sites could reach as deep as 600 m (2,000 ft). [1]

  5. Measured depth - Wikipedia

    en.wikipedia.org/wiki/Measured_depth

    For example, at the time of writing (2012) a borehole in Odoptu field, Sakhalin-I, has the greatest measured depth of any borehole at 12,345 m, but most of this is horizontal, giving it a true vertical depth of only 1,784 m.

  6. List of deepest mines - Wikipedia

    en.wikipedia.org/wiki/List_of_deepest_mines

    This list of deepest mines includes operational and non-operational mines that are at least 2,212 m (7,257 ft), which is the depth of Veryovkina Cave, the deepest known natural cave in the world.

  7. Deep hole drilling - Wikipedia

    en.wikipedia.org/wiki/Deep_hole_drilling

    In the field of manufacturing technology, deep hole drilling refers to the drilling of bore ... The "support" of the guide pads on the borehole wall also results in a ...

  8. How to Grow Winter Pansies, a Cold-Hardy Plant That Will Fill ...

    www.aol.com/lifestyle/grow-winter-pansies-cold...

    Dig a hole that's as deep as the distance from the bottom of the roots to the crown. Break apart the root ball so the roots don't continue growing in the same direction as they were in the pot ...

  9. 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).