Beyond these three uses, there is much disagreement over when to capitalize. Every major publication and publisher has its own standards, and many writers have their own preferences (which are generally overridden by in-house rules during publication).
Deep-sea trench. Deep-sea trench, also called oceanic trench , any long, narrow, steep-sided depression in the ocean bottom in which occur the maximum oceanic depths, approximately 7,300 to more than 11,000 metres (24,000 to 36,000 feet). They typically form in locations where one tectonic plate subducts under another.
Best Answer: man has been ALMOST to the deepest point in the sea Most parts of the ocean are about 5 kilometers (3 miles) deep. However, deep ocean trenches can be as much as 11 km (7 miles) deep. The deepest point in the world's oceans is the Challenger Deep, in the Marianas Trench; its depth is 11.03 km (36,200 feet). In 1953, the bathyscaphe (bathy = deep, scaphe = ship) Trieste descended to 35,800 ft (10.91 km) in the Challenger Deep.