The amount of psi that a human can survive is around 15 psi before the body begins to break down and after 15 to 20 PSI the body could break apart.
Generally, the human body can easily withstand up to about 15 psi (pounds per square inch) of external pressure before it begins to experience adverse effects.
However, the pressure amount that the human body can take can vary depending on the individual.
The amount of pressure at 20 feet underwater is only 40 psi which is relative to the surface or 54.7 psi if you're considering the atmospheric pressure as well.
The deeper you go the higher the pressure becomes and eventually if you go deep enough into the water your body would break apart due to the pressure.
The pressure at the Titanic wreck in PSI was around 6,000 PSI which is more than 41,000 kilopascals.
Under 6,000 psi pressure even a slightest structural flaw can result in fatal consequences and implosion.
As you go deeper underwater the pressure continues to build and build.
At the pressure of the depth of the Titanic the pressure on the human body would be brutal, and with the hydrostatic pressure- or force of a liquid on an object- multiplied 400 times what it is on the surface, the human body would likely perish way before it reaches the wreck.
Reaching the Titanic is not a simple feat.
The depth at which the Titanic wreck lies presents significant challenges, including extreme cold, high pressure, and the absence of natural light.
Efforts to locate and salvage the Titanic began almost immediately after it sank.
But technical limitations—as well as the sheer vastness of the North Atlantic search area—made it extremely difficult.
And the water in the deep sea is under saturated in calcium carbonate, which is mostly, you know, what bones are made of.
For example, on the Titanic and on the Bismarck, those ships are below the calcium carbonate compensation depth, so once the critters eat their flesh and expose the bones, the bones dissolve."
Many survivors of the Titanic said they had heard terrifying noises as the Titanic was breaking apart, but none mentioned hearing anything after the ship disappeared below the surface of the water.
Of the 337 bodies recovered, 119 were buried at sea.
209 were brought back to Halifax.
59 were claimed by relatives and shipped to their home communities.
The remaining 150 victims are buried in three cemeteries: Fairview Lawn, Mount Olivet and Baron de Hirsch.