The Cruel Sea is a powerful film that puts you in the battle of the Atlantic. The black and white photography unintentionally conveys the gritty reality of a grim war.(Somebody has said that World War II was a war fought in black and white.) And although the special effects are primitive by today's standards, they are still pretty impressive. The film is an prime example of the post war school of British cinema before it was subsumed by Hollywood. It is a fine film, a fine war film and a fine piece of accurate history.