Ocean carries much of the vast unconscious reserve; the collective unconscious; the depth of our emotions; memories; the mother of primordial womb; the cosmic source or primordial mother.

It can symbolize universal life; transitional forces at work; endless possibilities or potentiality. Ocean relates to the expansiveness, potential and storehouse of our being. Depending on how it appears it may serve as a barrier to access of or protection from something on the other side another world of awareness.
See water, boat, ship.