On September 6, 1776, Ezra Lee climbed inside a small egg shaped vessel carrying a very large bomb containing 150 pounds of gunpowder. Lee's mission was to attach the time bomb to the HMS Eagle: the flagship of a British fleet that was blockading the harbour during the American revolutionary war. However, no remains or plans of the Turtle survive and Bushnell's tiny sub failed to sink the British ship. A team of wood and metal craftsmen attempt to re-build the mini sub in order to discover if it was capable of attacking the Eagle.
Structural engineer Bashar Altabba, film designer Julian Bashar and an international team of carpenters and blacksmiths, travel to the ruined abbey of Hambye in Normandy, where they attempt to reconstruct a medieval cathedral crane and find whether the cranes really existed eight hundred years ago.
