the weight of water of ocean crushes a submarine in bottom.how come a small fısh lives there?
105354
the first response is mostly correct, fish have air bladders and most benthic fish (bottom dwelling) rarely leave the tremendous depths that they live in.  think about a whale which breathes air as we do, they can dive to well beyond the crushing depths of submarines, yet they have no problems with going up and down the water column all the time. they physics behind this are simply, they are adapted to their environment, whcih is the case of whales is both the surface and the lower levels of the ocean. \n\nwhales are a fascinating case, they are able to collect the dangerous by-products of deep diving in their bodies, either through air bladders and special ability to remove toxic gasses from their blood, but they are essentially mammals like humans; obviously you know they breathe the same air we do.  interesting question.  please read more about the ocean if you are interested click the link
972197
Water is allowed into the submarine as ballast and this weighs it down allowing it to submerge, when it needs to rise air is forced into the ballast tanks, displacing the water and reducing the weight of the ship causing it to rise.
254827
Their legs have been modified into flippers so they would be unable to move an land.  Also their pelvic and pectoral girdles would not be able to support their weight with out the help of the water.
618530
Scientists say that there is some chemical at the bottom of the sea only in that part which attracts everything which goesd above it, even birds! In our religion there is a belief that our 12th imam is invincible and stays there. There R quite many rumours but logical its correct.
828476
how long is  apeice of string???\nwouldnt it be good to see what is lurking at the bottom of the sea. could be a whole new world!! (well you never know!)
94309
because it is less dense than the water
860329
the land masses do not float on the sea rather the seas fill up the low lying areas of the earths crust so when you dive to the bottom of the sea you will hit the earths crust(after going through various layers of mud and organic matter. the deepest-known part of the ocean measures 10,924 meters (35,839 feet), in the Marianas Trench, i think i'm right in saying that we have dived down to around 7000m (7km).\nOnce you hit the crust (sea floor) and keep going you would then go through the earths various layers (not possible!) and eventually come out the other side!
286838
The Mariana Trench (or Marianas Trench) is the deepest known submarine trench, and the deepest location in the Earth's crust itself. It is located in the floor of the western North Pacific Ocean, to the east of the Mariana Islands at 11°21′N 142°12′E, which is near Guam. The trench is the boundary where two tectonic plates meet, a subduction zone where the Pacific Plate is being subducted under the Philippine Plate. The bottom of the trench is further below sea level than Mount Everest is above sea level.\n\nThe trench has a maximum depth of 10,911 m (35,798 feet) below sea level. Taking into account its latitude and the Earth's equatorial bulge, this puts it at 6,366.4 km from the centre of the Earth. The Arctic Ocean, on the other hand, is 4-4.5 km deep, which would put its floor at ~6,352.8 km from the Earth's centre, 13.6 km closer.\n\nIt was first surveyed in 1951 by the British navy vessel, Challenger II, which gave its name to the deepest part of the trench, the Challenger Deep. Using echo sounding, the Challenger II measured a depth of 5,960 fathoms (10,900 m) at 11°19′N 142°15′E. This sounding was repeatedly made using earphones to hear the return of the signal as the stylus passed across the graduated depth scale, whilst the timing of the speed of the echo-sounding machine, a necessary part of the process, was made with a hand held stopwatch. For these reasons it was considered prudent to subtract one scale division (of 20 fm) when officially reporting a new greatest depth of 5,940 fm (10,863 m).\n\nIn 1957, the Russian vessel Vityaz reported a depth of 11,034 m (36,201 ft), dubbed the Mariana Hollow; this measurement has never been replicated and is not considered accurate. In 1962 the M.V. Spencer F. Baird recorded a greatest depth of 10,915 m (35,810 ft). In 1984 the Japanese sent the Takuyo, a highly specialized survey vessel out to the Mariana Trench and collected data using a narrow, multi-beam echo sounder; they reported a maximum depth of 11,040.4 m1 (this is also reported as 10,920±10 m 2). The most accurate measurement on record was taken by another Japanese probe, Kaiko, on March 24, 1995: 10,911 m (35,798 ft) 3.\n\n \nJanuary 23, 1960: Just before the diveIn an unprecedented dive, the U.S. Navy bathyscaphe Trieste reached the bottom at 1:06 pm on January 23, 1960 with U.S. Navy Lt. Don Walsh and Jacques Piccard. Iron shot was used for ballast, with gasoline for buoyancy. The onboard systems indicated a depth of 37,800 ft (11,521 m), but this was later revised to 35,813 ft (10,916 m). At the bottom Walsh and Piccard were surprised to discover soles or flounder about one foot (30 cm) long, as well as shrimp. According to Piccard, "The bottom appeared light and clear, a waste of firm diatomaceous ooze".\n\nAt the bottom of the Mariana Trench, water exerts a pressure of 1086 bar (108.6 MPa or 15,751 psi), over 1000 times the standard atmospheric pressure at sea level.
434745
due to earthquakes formed under sea...
276531
I'm curious to know as well since it seems most US submarines were sunk by aircraft, which generally means on or near the surface ...
395042
Yes, there is no light at the bottom of the ocean. Fish are extremely small, measureing about 3 to 6 inches and are bioluminecent - meaning they glow in the dark. For several reasons: Attracting food - other unsuspecting fish, or for mating. It is not easy finding a mate at the bottom of the ocean. The fish are small because food is scarce so potential for growth is naturally limited. The fish's eyes are usually large in proportion to the body size to allow the maximum amount of light in for vision, if they have eyes at all. There is snow, but not the kind you and I might know, it is called marine snow. It falls just like snow on land, and never stops. This consists mainly of tests, or shells, from dead marine organisms from the above waters, or organic matter. Organic matter is anything that contains carbon. The bottom of the ocean is a cool place. Have you heard of hydrothermal vents? They contain chemosynthetic organisms that obtain energy by breaking down inorganic chemicals. Humans rely on the sun for producing all of our energy. Well anyways I am rambling. But I like it.\n\nAlso remember at the bottom of the ocean there is pressure, much more than you feel at the surface of the earth. Thousands of pounds of pressure pushing in from all directions. Squish, squish.
372889
Every body that is in a fluid, or it is floating on the surface, or is sunk to the bottom loses an equal ammount of weight as the weight of the displaced fluid by the volume of the body.\n\nThe force that makes body's float or makes them lighter in a fluid (for ex. water) is called Archimed's force or Archimed's principle.\nIf this force is grater then the weight of the body (G=m*g) then the body floats on the surface.\n\nArchimed's force is greater if the density of the fluid is bigger. Oil has the density of 900 g/cm3 and water has the density of 1000 g/cm3. Because the reason why the objects are floating in oil and in water is of same nature, floating on oil is similar to floating on water.\nBut water has a bigger push force then oil.
110828
Archimedes said: When an object is submerged in water, there is a buoyant force upwards on it that is equivalent to the weight of the water displaced. \n\nSo if you have a heavy object underwater, and it is displacing water, its net weight will be less than when it is in air, displacing air, which is much lighter, so has a much smaller buoyant effect.
342105
chuck a body down there and listen for the thud. if you hear no thud then it's bottomless. if you hear one you can gauge the depth off of how long it took to hit.
823437
If you take a balloon under water, and go further and further, the air becomes more dense...due to PRESSURE.   The way a submarine dives is completely different then denser/less dense ....it's that they are mostly filled with air...so they should float...but they have enough weight that they sink too,  it's almost a balance, but they have tanks that they let fill with water to sink, or push air in (and water out) to get lighter and float.
193750
This is due to the seawater having a greater heat capacity than the land, thus they heat and cool off at different rates, causing pressure differentials in the air above them. See the source for details.
1036795
There is an extremely high amount of pressure and weight underground. Things get compacted because of it. There are some parts of the surface of the Earth that we still can't explore because we haven't got the technology to withstand the pressure. (Mariana Trench)