In April 1925, the Allies are poised to launch a major landing on the nearby Gallipoli peninsula. Their objective is to open up a new front and knock Turkey out of the war. This is the gripping story of a submarine with an awesome history, thought lost forever…and the ambitious plans to raise her. It combines a hazardous underwater expedition, with the spine-tingling tale of one of the most audacious missions ever undertaken by a submarine.