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This is why kids aren't allowed on 4chan.
Water pressure results from water pushing into a less dense area with no water: a vacuum or an air pocket. The air is pushing outwards because it is less dense than water, and the water is pushing inwards on the air capsule because it is more dense than it. Normally, this would simply cause the air to bubble towards the surface. However, in many cases, a solid barrier is blocking this, and assuming that that barrier can withstand the pressure between the water and the air, the air remains trapped within the capsule as pressure continues.
When the titanic sank, the bow of the ship slowly filled with water while the stern did not. When the stern dipped beneath the water, it had not fully filled with water; there was air, and presumably some passengers within that air, still trapped within. Because of this, there was a violent explosion as the steel hull and wooden walls collapsed due to mounting water pressure as more and more water from the outside began pounding on them. That's why when you look at the stern of the titanic, it looks destroyed in comparison to the bow.
In summary, water pressure results from a dynamic between water and air. Assuming there's no air, as with the totally submerged, solid wreck of the titanic, there's no pressure.
