Having already found the Titanic, the Bismarck and numerous other wrecks, Dr Robert Ballard, probably the world’s greatest shipwreck hunter, is out searching in deep waters with his unmanned submarines looking for answers to one of the bloodiest and most controversial battles of World War one. In what was to become one of the bloodiest and most futile battles of the modern era, Ballard wants to find out why it all went so horribly wrong, but the answers lie not on the battlefields but beneath the waves.