Mount Everest is the highest mountain in the world, but there is a trench that is much deeper than Mount Everest is high. So if you could turn this trench upside down it would be much higher than Everest. Where is this trench and how deep is it?

potterguy

Well, it's most likely the Mariana's Trench in the Pacific. Don't have the depth at hand, but memory says it's well over 30,000 feet below sea level. The Mariana Trench (or Mariana's Trench) is the deepest part of the world's oceans, and the deepest location on the surface of the Earth's crust. It has a maximum depth of about 11 km (6.8 mi), and is located in the western North Pacific Ocean, to the east and south of the Mariana Islands, near Guam. The trench forms the boundary between two tectonic plates, where the Pacific Plate is subducted beneath the Philippine Plate. The bottom of the trench is farther below sea level than Mount Everest is above it (8,848m/29,028ft). At the bottom, the water column above exerts a pressure of 108.6 MPa, over one thousand times the standard atmospheric pressure at sea level. http://en.wikipedia.org/wiki/Mariana_Trench [Added reference - McG] Jun 21 04, 6:27 PM

YoungSmart

The Mariana Trench in the Pacific is 11032m deep at its deepest. Over 2km difference. http://www.marianatrench.com/ [Added reference link - McG] Jun 21 04, 10:44 PM

oviphagy

The exact spot is called "Challenger Deep." http://en.wikipedia.org/wiki/Challenger_Deep The Challenger Deep is the deepest surveyed point in the oceans, with a depth of about 11,000 metres (about 36,000 feet). It is located in the Mariana Islands group at the southern end of the Mariana Trench. The closest land is Fais Island, one of the outer islands of Yap, 289 km southwest and Guam 306 km to the northeast. The point is named after the British Royal Navy survey ship HMS Challenger, which first surveyed the trench in 1951. The maximum surveyed depth of the Challenger Deep is 10,923 meters (35,838 feet) or 6.7875 miles. (National Geographic puts the depth at 10,920.07 meters (35,827 feet) below sea level.) The pressure at this depth is approximately 1,095 times that at the surface, or 110 MPa. The HMS Challenger Expedition (December 1872 – May 1876) first sounded the depths now known as the Challenger Deep. This first sounding was made on 23 March, 1875 at station 225. The reported depth was 4,475 fathoms (8,184 m, 26,850 ft), based on two separate soundings. In 1951, about 75 years after its original discovery, the entire Mariana Trench was surveyed by a second Royal Navy vessel, also named HMS Challenger after the original expedition ship. During this survey, the deepest part of the trench was recorded using echo sounding, a much more precise and vastly easier way to measure depth than the sounding equipment and drag lines used in the original expedition. HMS Challenger measured a depth of 5,960 fathoms (10,900 m, 35,760 ft) at 11°19′N, 142°15′E. [Added text from the reference link - McG] Jun 19 08, 1:15 PM