To dream that you are underwater means that you feel out of some situation or relationships. Sometimes the dreamer who is underwater is trying to hide himself/herself from the world because he or she doesnt know how to act in certain situation. If you see the other person being underwater, it could have the same meaning if you were underwater and this person might need your help and support.
Dream dictionary: being sha kled underwater dream meanings
…a believer may be differently interpreted than the dream of a disbeliever. If one sees the month of Ramadan in his dream, his dream means blessings, profits, commanding good and forbidding evil. If the person is seeking knowledge, then knowledge will be given to him, for it is during this great month that the Holy Qur’an was revealed. If the person is inflicted with epilepsy, he will recover from it, for the devils and all evil spirits are shackled and are rendered powerless during this month. As for the tenth lunar month, known in Arabic as Shawwal. if one’s dream suggests a war or a conflict, it means that he will come first in it, and that he will triumph. If one sees the month of Shawwal in his dream, it means that he will come out of difficulties and finds happiness and devotion, for it is the month during…
If you are swimming in a dream, such dream foretells about your emotions that are floating within. You are the person who does not initiate things by himself, instead you adapt to the present circumstances. The swimming is also a symbol of freedom. To swim underwater, means that you dispose other opinions and stay putted only with your own instincts.
If we dream that fishes are escaping from our hands when we try to get them out of the sea, then this reflects our emotional frustrations. Seeing fishes swimming between rocks or hiding underwater tells us about the desire of evading responsibilities that are a burden to us.