Silent Hunter 4: Wolves of the Pacific (known in the United States as Silent Hunter: Wolves of the Pacific) is a computer submarine simulation for Windows developed by Ubisoft Romania and published by Ubisoft in 2007. It places the player in command of an American submarine during World War II and takes place in the Pacific theater. The game allows players a variety of play modes including career, single war patrol and single battle engagements. An expansion pack, The U-Boat Missions, was released in 2008.