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The Sirena Deep, originally named the HMRG Deep, was discovered in 1997 [1] [2] by a team of scientists from Hawaii. [2] Its directly measured depth of 10,714 m (35,151 ft) is third only to the Challenger Deep and Horizon Deep , currently the deepest known directly measured places in the ocean.
The deepest point below the ocean's atmospheric surface is Challenger Deep, at the bottom of the Mariana Trench, 11,034 m (36,201 ft) below sea level. [28] Jacques Piccard and U.S. Navy Lieutenant Don Walsh first reached Challenger Deep in 1960 aboard the bathyscaphe Trieste , followed by filmmaker James Cameron in 2012 aboard Deepsea Challenger .
During the ROV ABISMO's deepest sea trails dive its manometer measured a depth of 10,257 m (33,652 ft) ±3 m (10 ft) in "Area 1" (vicinity of 12°43' N, 143°33' E). [ 204 ] [ 205 ] Leg 2, under chief scientist Takashi Murashima, operated at the Challenger Deep 8–9 June 2008, testing JAMSTEC's new full ocean depth "Free Fall Mooring System ...
Low-TDS groundwater is tapped by boreholes in the shore area at depths of 40–280, 500, 1,750, and 2,250 m below sea level, which suggests the existence of a deep flow system with vigorous flow. Submarine discharge along the Arabika coast is reported at depths up to ~400 m b.s.l.
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. The sinkhole is a doubly nested structure—the upper bowl is 320 meters (1,050 feet) deep, the lower bowl is 342 meters (1,122 feet) deep, and the two bowls are on average 257 to 268 m (843 to 879 ft) across.
The crater depth is 7,152 m (23,465 ft) below the standard topographic datum of Mars. [1] Hellas Planitia / ˈ h ɛ l ə s p l ə ˈ n ɪ ʃ i ə / is a plain located within the huge, roughly circular impact basin Hellas [a] located in the southern hemisphere of the planet Mars. [3] Hellas is the fourth- or fifth-largest known impact crater in ...
Parker Dam is a concrete arch-gravity dam that crosses the Colorado River 155 miles (249 km) downstream of Hoover Dam.Built between 1934 and 1938 by the Bureau of Reclamation, it is 320 feet (98 m) high, 235 feet (72 m) of which are below the riverbed (the deep excavation was necessary in order to reach the bedrock on which the foundation of the dam was built), [1] [2] making it the deepest ...
It is the deepest canyon in the world, [1] [a] and at 504.6 kilometres (313.5 mi) is slightly longer than the Grand Canyon in the United States, making it one of the world's largest.