I check it out...Ongoing research at universities and dolphin centers around the world suggests that the sounds that dolphins make when they communicate underwater have a therapeutic effect. It is believed that swimming with dolphins, due to their sonar function, improves a person's immune system and stimulates the production of hormones and neurotransmitters, which are responsible for sensations such as peacefulness, happiness, self-awareness, and high self-esteem. My son is an ocean animal lover, i'm sure he will be delighted with this idea, thanks for bringing it up!