If the water in the oceans would not have been compressed, then the level of the oceans would rise by 30 meters

If the water in the oceans would not have been compressed, then the level of the oceans would rise by 30 meters, how can the compression of water be explained by the decrease in the volume of molecules or the gap between them?

The ocean is a huge body of water. The deeper the ocean, the higher the pressure on the lower layers of the water. Because of this pressure, the gap between the molecules decreases, relative to which they can form trajectories of movement, and the water is compressed.

Therefore, the correct answer: the compression of water occurs by reducing the gap between them.