Wales Border to Border (S06E05)

The journey along the breathtaking Welsh coastline unfolds from the Severn estuary to the Dee estuary. Nick Crane delves into historical evidence of a catastrophic tsunami that struck Wales and England around 400 years ago, obliterating villages and claiming countless lives, leading survivors to ponder divine retribution. He also learns why scientists see the Welsh coast as an ideal analog for Mars during Red Planet expeditions. Alice Roberts attempts a helium balloon flight to explore claims of a Welsh carpenter's pioneering powered flight. Meanwhile, Miranda Krestovnikoff visits Grassholm, a bird sanctuary rarely seen by humans. Dick Strawbridge investigates how two brothers' 1947 sand sketch inspired the Land Rover, while Tessa Dunlop recounts the efforts of local volunteers who provided aid to 3,000 Ugandan Asians during a harsh winter in a Welsh military base.