Steel Diver is a Nintendo 3DS video game. Originally shown off in 2004 as a Nintendo DS tech demo, Steel Diver was later revived after many years for the system's successor. In the game the player controls a submarine. The game received mixed reviews. The game takes place sometime in the 1900s (the game simply states 19xx) when a nation that thirsts for power begins invading its neighbors. The player takes on the role of a master submarine driver who plans to stop the invading nation from taking over the world.