Iolo's Welsh Sea

Gower Peninsula (1x4)

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Iolo Williams concludes his journey around Wales, joining a shark-tagging project in the Celtic Deep, investigating a sunken seaplane in the murky waters of Pembroke Dock, and paddle-boarding off the Gower Peninsula. In his final stretch from Swansea to the Severn Bridge, the presenter meets a commercial diver in the city's marina and goes on patrol with the Cardiff police boat team. Last in the series.