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  2. Xiaozhai Tiankeng - Wikipedia

    en.wikipedia.org/wiki/Xiaozhai_Tiankeng

    The Xiaozhai Tiankeng is 626 meters (2,054 feet) long, 537 meters (1,762 feet) wide, and between 511 and 662 meters (1,677 and 2,172 ft) deep, with vertical walls. Its volume is 119,349,000 m³ and the area of its opening is 274,000 m 2. This material has been dissolved and carried away by the river.

  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. List of sinkholes - Wikipedia

    en.wikipedia.org/wiki/List_of_sinkholes

    Blue Hole (Red Sea) – a submarine sinkhole around 94 m (308 feet) deep in east Sinai, a few kilometres north of Dahab, Egypt on the coast of the Red Sea. Dead Sea sinkholes; Dean's Blue Hole – the world's second deepest known salt water blue hole with an entrance below the sea level; in the Bahamas

  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. ‘Blue hole’ is largest ever discovered at 1.3K feet deep ...

    www.aol.com/blue-hole-largest-ever-discovered...

    That’s 480 feet deeper than the previous record holder, the Sansha Yongle Blue Hole, aka the Dragon Hole, in the South China Sea, which measures 990 feet to the bottom.

  7. 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 ...

  8. Sinkhole - Wikipedia

    en.wikipedia.org/wiki/Sinkhole

    The 2010 Guatemala City sinkhole formed suddenly in May of that year; torrential rains from Tropical Storm Agatha and a bad drainage system were blamed for its creation. It swallowed a three-story building and a house; it measured approximately 20 m (66 ft) wide and 30 m (98 ft) deep. [47] A similar hole had formed nearby in February 2007.

  9. 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]