Submarine
In some dreams may take the place of the symbol of the whale, so represent powerful feelings and urges emerging from the unconscious. But the submarine is also a way to explore your own inner content and wisdom.
This is your ability to meet the depths of feelings and experiences in your unconscious, as well as functioning okay in the everyday world. Any sort of boat also has the possible suggestion of relationship, especially if there is some expression of this in the dream. Therefore the feelings expressed in the dream may refer to unconscious feeling in a relationship. If the submarine is threatening, then it could be fears of internal emotions or urges. If the submarine is surfacing the emotions may be breaking through into your everyday life. See: Ship; Whale.