At midnight on Sunday May 31 1942, three Japanese midget submarines broke through Sydney Harbour's defences and launched a surprise attack on an ill-prepared city. During that night of confusion and violence, 21 Allied and six Japanese servicemen lost their lives. Through interviews with the remaining survivors of the mission - both Australian and Japanese - as well as the family members of the Japanese submariners, Sydney At War: The Untold Story recalls the events of that evening and its subsequent impact on the lives of those involved. In Japan where the subject of war is difficult, rarely do films dealing with these issues have the opportunity to present the both sides of the story. With the passing of time it has now become easier for the submariners to reflect on their mission. But it has not reduced the grief of the families of those Japanese servicemen who did not return home.