In 1915, the liner Persia was torpedoed by renegade U-boat ace Max Valentiner and sank without trace, with the loss of 334 lives. The location of the fated vessel and her precious cargo of gold and jewels has remained a mystery until now. Moya and Alec Crawford undertake the deepest-ever salvage dive to recover the ship's riches while Doctor Eric Grove sheds light on Max Valentiner's motives. Follow these experts on their daunting missions to solve the puzzle of the lost and forgotten liner. Will they succeed, or is the fate of the Persia destined to remain a mystery forever?