It feels like Maurice Elvey attempted to weave together several plot threads into what could have been a straightforward story of escape. The film unfolds during World War I, featuring "Hamilton" (played acceptably by Barry K. Barnes), who leaves behind the harsh realities of trench warfare for life as a prisoner of war. Along with other prisoners, he concentrates on devising an escape plan. They come up with various methods not only to dig a tunnel but also to conceal their actions from Meinhart Maur, the camp commandant, whose portrayal seems somewhat exaggerated. Simultaneously, we learn that his wife, "Sarah" (Sophie Stewart), is meeting “Beck” (Jack Hawkins, who delivers a rather uninspired performance) at home, and this introduces a melodramatic element through flashbacks that I don't think was necessary for the film’s adventure elements. Occasionally, it provides a powerful look at the circumstances and attitudes of the era, and some of the portrayals of stoicism feel authentic. However, there are too many forced attempts at humor, and perhaps one stereotype stands out. The story is rooted in actual events, making it worthwhile to view, especially considering how evident it was that another war was looming when this film was released.

Source on TMDB