5. The Killer Wave of 1607

It's 9am on 20 January 1607: a 12ft-high wall of water devastates the counties of the Bristol Channel, killing in the region of 2,000. The catastrophe altered the coastline for ever - yet it's been all but forgotten. Scientists Ted Bryant and Simon Haslett team up to find archaeological evidence to support their belief that the event was not a freak storm but a tsunami.