USS Nautilus (SSN-571) was the world’s first operational nuclear-powered submarine and the first submarine to complete a submerged transit of the North Pole.
Stier was a German auxiliary cruiser of World War II. The name Stier means “bull”. She was the last German raider to break out into the Atlantic in World War II.
In the late sixties the German Navy realized the necessity for a new fast attack craft to counter missile boats of the Russian navy. They were not used after the cold war, and the ships were decommissioned in 2004 and 2005.