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This week Sean travels down beautiful Cardigan Bay, where he helps monitor the local dolphin population, discovers a four thousand year old sunken forest on a beach and takes part in a Celtic Longboat rowing race.
The second leg of his journey takes Sean along the Llŷn Peninsula in north west Wales.
Sean starts his journey at Bangor where he joins the crew of 1930s sailing ship the Vilma to help steer her down the Menai Strait.
This time, in Pembrokeshire, Sean meets a family who have moved to the coast to live off-grid and takes part in an archeological dig to unearth the secrets of a medieval chapel.
Then he joins members of a Blind Society to find out how they use sound to experience the coast and discovers baby seals at Castlemartin military firing range.