British Museum expert Dr Irving Finkel reveals how decoding the symbols on a 4,000 year old piece of clay enable a radical new interpretation of the Noah's Ark myth. His real-life detective story began with a most remarkable event at the British Museum - the arrival one day in 2008 of a modest-sized Babylonian cuneiform tablet dating from 1850 BC and revealing, among other things, instructions for building a large boat to survive a flood.