Melonie and Dave are in their late twenties, married for five years their sex life is very good but perhaps a little routine. Mel is a writer with a curiosity for something new. Dave is willing to experiment too. Three close friends of Dave and a boat trip to the Bahamas opens a whole new world of possibilities to them. Dipping their toes in the water reveals to them that underwater is a world filled with wildlife. A world they decide to join and find it will provide a life full of stimulating friends and adventure.