Anna Jones paddleboards the rocky coastline of Pembrokeshire, listening to the mysterious growling sounds of the sea caves. As the tide rises, water sloshes into holes in the rock and squeezes out puffs of air - or could it, maybe, be a dragon? Paddling in and out of the caves and coves, Anna and local instructor Libby Chivers allow their imaginations to run wild, picturing dragons and sea monsters deep in the darkness. It's easy to get carried away - literally - on an inflatable paddleboard, so Libby shares her top tips for staying safe on the sea. With Stand-Up Paddleboarding becoming ever more popular with water sports amateurs like Anna, rescues are on the rise. Libby shares her story of pulling a panic-stricken girl from the water and explains how lifeguards helped thirty paddleboarders back to the shore in a single day on one Welsh beach. Swept up by the atmosphere of the sea caves, Anna dries off and heads into Fishguard to learn more about the town's legends and folklore. Amid mysterious tales of pirates, smugglers and mermaids, there's the real-life story of the last invasion of Britain - when French soldiers landed at Fishguard in 1797. Local historian Edward Perkins shares the amazing story of Welsh heroine Jemima Nicholas, who fended them off armed only with a pitchfork. Presented and produced by Anna Jones