Soviet submarine B-515 was a Tango-class submarine of the Soviet and Russian Navies. She remained in active service until 2001. She is currently docked in Hamburg and is open to the public as a museum exhibit.

This submarine was used for hunting, espionage, and patrol purposes. A 78-man crew operated the boat.

The submarine U-434 came from the Krasnoye Sormovo submarine shipyard in Nizhny Novgorod and was built in 1976 in just eight months. It was placed in the service of the Soviet Northern Fleet and remained in service until April 2002.