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The team have three days to explore the skeleton of a medieval warship found on the bed of the River Hamble near Southampton. They must prove whether it is the Grace Dieu, Henry V's naval flagship, and also find out how big it was and just why it came to grief. The team are joined by John Adams (marine archeologist) and Susan Rose (historian). Damian Goodburn (ancient ship expert) attempts to reproduce a small section of the massive ship's clinker built hull.
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