NO BREEZE STIRRED THE WATERS, YET THEY MOVED... A trip round Northumberland Island - an ideal treat for a summer's day - goes terribly wrong for young George Smith when he is sucked into the depths of a whirlpool down to a watery grave. But is he lost forever? When Dr Jackson and Professor Morrison, scientists at Newcastle University, receive a gleaming prism with a letter from the missing boy - now a grown man - they begin to wonder. Soon the whole nation and the world's press are up in arms about the secret that's been kept from them: the astonishing discovery of a new world beneath the sea. Join Jackson, Morrison and their mission team as they stretch science and physical endurance to the limit establishing contact with the mysterious denizens of the deep - the creatures of the Emerald Realm!