This week, the underwater bike that holiday makers can use to zoom around the sea-bed, the light backpack scuba gear and the Hollywood trickery that makes filming underwater possible. Presented by Philippa Forrester and Peter Snow. Producer Gill Tierney ; Editor Saul Nasse
Repeated next Wednesday with sign language (S) (W) FURTHER INFORMATION: Ceefax page 623: www.bbc.co.uk/tw