The pubs and clubs of Devonport's notorious Union Street are throbbing with laughter and life. Hundreds of sailors - out on a gaudy night ashore - drink away their last hours on home soil for six months. On the morning tide the largest ship in the fleet will thread her way out of the trickiest harbour in the land. The Captain of HMS Ark Royal and his Commander have a testing few hours ahead - a challenging exercise in navigation and the task of forging the sailors once more into a shipshape crew.As Ark inches into the open sea, the vice of naval discipline begins to bite...