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[3] The second deepest is the Dragon Hole, or Longdong, in the South China Sea at 300.89 metres (987 ft) deep, [4] while the third deepest blue hole in the world is Dean's Blue Hole at 202 metres (663 ft) , located in a bay west of Clarence Town on Long Island, Bahamas. Other blue holes are about half that depth at around 100–120 metres (330 ...
Space debris began to accumulate in Earth orbit with the launch of the first artificial satellite, Sputnik 1, into orbit in October, 1957. But even before this event, humans might have produced ejecta that became space debris, as in the August 1957 Pascal B test. [19] [20] Going back further, natural ejecta from Earth has entered orbit.
Lighthouse Reef as seen from space. The Great Blue Hole is near the center of the photograph. The Great Blue Hole is a large marine sinkhole off the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll 70 km (43 mi) from the mainland and Belize City. The hole is circular in shape, 318 m (1,043 ft) across and 124 m (407 ...
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Indeed, while TBJH was initially discovered in 2021, scientists only measured its depth down to 900 feet due to limitations in the echo-sounder technology — which calculates speed based on sound ...
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The Great Blue Hole, a giant submarine sinkhole, near Ambergris Caye, Belize. The following is a list of sinkholes, blue holes, dolines, crown holes, cenotes, and pit caves. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer.
Blue Hole – Dahab, Egypt. A round sinkhole or blue hole, 130 m (430 ft) deep. It includes an archway leading out to the Red Sea at 60 m (200 ft), which has been the site for many freediving and scuba attempts, the latter often fatal. [58] Akhayat sinkhole is in Mersin Province, Turkey. Its dimensions are about 150 m (490 ft) in diameter with ...