An award-winning documentary about the underwater habitats and marine life of Cornwall's Fal Estuary. It was the first time that cuttlefish mating and egg laying had been filmed in British waters. It was Victoria Stone and Mark Deeble's first film and was instrumental in preventing a container port being built in the Fal Estuary. It was the first British underwater wildlife film to treat the underwater world the same as topside when it came to cinematography and sequence building and was the start of the husband and wife team's 20 year association with Survival Anglia.