I have a friend who is a certified hypnotherapist come in for a watsu session. He was impressed with how comforting and relaxing an experience it was, despite him not being much of a "water person." He likened it to the deep state of relaxation that he had only ever been able to achieve via hypnosis.
We had a brief discussion about how well the two therapies, watsu and hypnosis, could work together. The idea of being able to get someone into a more advanced state of relaxation is interesting to me, to say the least. While he is excited about being able to do accelerate subconscious work with the added benefit of the person already being relaxed via floating in warm water. Perhaps there will be a collaboration in the future.