1. Someone one admires.
2. Having to do with the sea.
If you see your vessel sailing without you, much personal discomfort will be wrought you by rivals.... Ten Thousand Dream Interpretation
A submarine is a powerful moving machine that travels through deep waters. Deep waters represent our emotions and our unconscious.
A submarine could represent the way in which we are navigating through our emotional waters and deal with the materials that are coming up from our unconscious.
A submarine can have negative or positive connotations. It could suggest that you are feeling strong and are prepared to aggressively deal with whatever issues and emotional concerns that arise in your life. On the other hand, the submarine as a dream symbol could be suggesting that you are overly guarded and defensive and are currently not open to airing of personal issues. ... The Bedside Dream Dictionary
2- If we are to be comfortable with ourselves we need to understand our subconscious urges. Since there can be some fear - and in some cases the need for protection the submarine can be a good image to use.
3- Dreaming of a submarine indicates we have a spiritual need to get underneath our emotions.... Ten Thousand Dream Dictionary