Myths, legends and tales from around the world jump off the pages and straight into children's imagination in this innovative mix of animation and live action. Children help create the artwork and play all the characters, creating a fantastic mix of multi-layered pop-up book and magical stage play. In this famous tale from Ceredigion on the west coast of Wales, we discover why we can still hear the bell of the drowned land of Cantre'r Gwaelod ring today.