The absolute pressure at a depth h below the surface of the ocean is 1.5p where p is the atmospheric

It's not clear just what you are talking about. All pressure is relative. What we call "absolute" is relative to a vacuum, and that means you are measuring water pressure plus atmospheric pressure. Water has a fairly constant density, so the pressure at any depth relative to the surface is a function only of the depth. But trying to specify absolute pressure confuses the problem. Absolute pressure at the surface is p, so the relative pressure at the first measurement is 0.5p and at the second it is p. But p is not constant.

Since p is close to 16 psi or 32 feet of water, water pressure is close to 1/2 psi per foot of depth.