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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. 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.

4. Boesmansgat - Wikipedia

   en.wikipedia.org/wiki/Boesmansgat

   Boesmansgat (or Bushmansgat), also known in English as "Bushman's Hole", is a deep submerged freshwater cave (or sinkhole) in the Northern Cape province of South Africa, which has been dived to a depth of 282.6 metres (927 ft). Boesmansgat was believed to have first been explored by amateur diver Mike Rathbourne, in 1977.

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. Scientists Are Planning on Plunging Into the World’s ‘Portal ...

   www.aol.com/scientists-planning-plunging-world...

   Known as Dean’s Blue Hole, this geological wonder located off the coast of Long Island is a staggering 663 feet deep, making it one of the deepest blue holes in the world and also an area ripe ...

7. Dean's Blue Hole - Wikipedia

   en.wikipedia.org/wiki/Dean's_Blue_Hole

   Dean's Blue Hole is a blue hole located in The Bahamas in a bay west of Clarence Town on Long Island and is the world's third deepest with a depth of 202 metres (663 ft), after the Taam Ja' Blue Hole in the Chetumal Bay and the Dragon Hole in the South China Sea.

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

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

   In 2012, scientists exploring blue holes in the Bahamas discovered bacteria deep in the caves where no other life existed, potentially filling the knowledge “gap” on what types of lifeforms ...

9. Dragon Hole - Wikipedia

   en.wikipedia.org/wiki/Dragon_Hole

   Dragon Hole is about 100 metres (330 ft) deeper than Dean's Blue Hole in the Bahamas. There are several fresh water sinkholes on land that are deeper than Dragon Hole. These include Mexico's Zacatón (335 metres (1,099 ft)), Pozzo del Merro in Italy (392 metres (1,286 ft)) [4] [5] and Hranice abyss in the Czech Republic (404 metres (1,325 ft)).