Kizzee. . Apparently the pressure at the bottom of the Atlantic is very heavy, something like several tons per inch. . At the bottom of the trench, the water column above exerts a pressure of 1,086 bars (15,750 psi), more than 1,071 times the standard atmospheric pressure at sea level. Anyway, my question is: if that water pressure down there would kill a person, then why didn't it just destroy all the artifacts in Titanic, and why didn't it destroy Titanic itself? The average depth of the Arctic Ocean is about 1200 meters while the average depth of the Atlantic Ocean is about 3900 meters. At the bottom of trenches like the Mariana, the water is freezing cold, there is no light, and the pressure is pulverising. The average ocean depth is 12,566 feet about 3800 meters. Every 33 feet underwater, the pressure increases another 14.5 PSI. In the Mariana Trench—7,000 meters below the ocean’s surface—these fish makes a living in total darkness and at crushing pressures that can reach 1,000 times more than at sea level. If we shaved off all the continents and filled the trenches in the oceans with the earth from the continents, the entire globe would be covered with water about 2 miles in depth. The ocean is deep. And another question: I've seen pictures of fish that live way down at the bottom on the wreck. Human beings can withstand 3 to 4 atmospheres of pressure… Source(s): 82% 1 1. Due to these variations, when the formula was used to obtain a value for the pressure at the deepest point of the oceans, they vary from 1.10 × 10 8 pascals to 1.15 × 10 8 pascals. That creates a huge pressure difference. In a periodical, the average pressure was given to be 1.24 × 10 8 Pa. Pressure at the bottom of the ocean is high.No body can breath in the ocean ,except for the creature who live the the bottom of the ocean.Also the elevation of the ocean or sea is so high ,and covering the photosythesis (oxygen),so you can't breath. The greatest ocean depth is … Well the answer depends on what ocean you're speaking about. The temperature at the bottom is 1 to 4 °C (34 to 39 °F). A couple feet of water pressure isn’t enough to do serious damage yet, but looking at deeper levels shows how pressure affects us a little more gradually. Today, with the use of sonar tracking and attached time-depth recorders, dives as deep as 6,000 feet (more than a mile below the surface of the ocean) have been measured. At surface level, the pressure exerted on us is at 14.5 PSI. Assuming the density of sea water to be 1025 kg/m³ (in fact it is slightly variable), pressure increases by 1 atm with each 10 m of depth. At this pressure, the density of water is increased by 4.96%. At 6.8 miles below the surface, the pressure is the equivalent of three SUVs sitting on your toe. Diver must alter their habits according to the pressure they experience. This means that only 33 feet below the ocean, you would already be facing twice the surface pressure. The unit that we use to measure pressure is pounds per square inch, aka PSI. You are always under pressure. One of the risks of a dive so deep is extreme water pressure. . Air presses down on you at all times at 14.5 pounds per square inch, also called one bar or one atmosphere.