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The greatest ocean depth measured is in the Challenger Deep of the Mariana Trench, at a depth of 10,994 m (36,070 ft) below sea level. Oceanic trenches are a feature of the Earth's distinctive plate tectonics .
The hadal zone, also known as the hadopelagic zone, is the deepest region of the ocean, lying within oceanic trenches.The hadal zone ranges from around 6 to 11 km (3.7 to 6.8 mi; 20,000 to 36,000 ft) below sea level, and exists in long, narrow, topographic V-shaped depressions.
Location Depth Depth Depth 1 Challenger Deep: Izu–Bonin–Mariana Arc, Mariana Trench, Pacific Ocean 11,034 36,197 6.86 2 Tonga Trench: Pacific Ocean 10,882 35,702 6.76 3 Emden Deep: Philippine Trench, Pacific Ocean 10,545 34,580 6.54 4 Kuril–Kamchatka Trench: Pacific Ocean 10,542 34,449 6.52 5 Kermadec Trench: Pacific Ocean
The Hellenic Trench, with the inner South Aegean Volcanic Arc, and the outer non-volcanic Hellenic arc [1]: 34 . The Hellenic Trench (HT) is an oceanic trough located in the forearc of the Hellenic arc, an arcuate archipelago on the southern margin of the Aegean Sea plate, or Aegean Plate, also called Aegea, the basement of the Aegean Sea.
The Mariana Trench is an oceanic trench located in the western Pacific Ocean, about 200 kilometres (124 mi) east of the Mariana Islands; it is the deepest oceanic trench on Earth. It is crescent-shaped and measures about 2,550 km (1,580 mi) in length and 69 km (43 mi) in width.
In marked contrast to the Kairei surveys of 1998 and 1999, the detailed survey in 2002 determined that the deepest point in the Challenger Deep is located in the eastern basin around , with a depth of 10,920 ± 5 m (35,827 ± 16 ft), located about 290 m (950 ft) southeast of the deepest site determined by the survey vessel Takuyo in 1984. The ...
Like many other theorists, he points to a depressurisation of the cabin by the pilot to knock the 239 passengers unconscious as the pilot made a U-turn to ditch the plane in the ocean.
The relatively narrow trough trends east-northeast to west-southwest and has a maximum depth of 7,686 metres (25,217 ft). Within the trough is a slowly spreading north–south ridge which may be the result of an offset or gap of approximately 420 kilometres (260 mi) along the main fault trace.