In the late 1800s, Mr. John Holland hit upon the idea of powering a submarine with an internal combustion engine and an electric motor. In 1901, the Holland I was launched. The Second World War showed the first widespread use of these underwater vessels. From the first attempts during the American Civil War to that widespread use during World War II, the history of the submarine has been fraught with difficulties. Rare archival footage and film of the last surviving submarines provides a unique glimpse into the world of submarine warfare.