Civil engineers Graham Harris and Les MacPhie have spent over a decade investigating the enigma of Nova Scotia's Oak Island. In this new edition of their book, they set out the previously unknown story of how complex and expensive engineering work was undertaken to create an elaborate flood tunnel on the island. Built to frustrate treasure seekers attempting to get at the valuables buried decades earlier at the bottom of the island's Money Pit, the tunnel has admirably served its purpose. It has ensured that all efforts up to now to recover the treasure have been unsuccessful.

Oak...