On a beach on the eastern lip of the fjord at Laboe is a wartime U-boat that has been turned into a technical museum.
You can get there from Kiel on the 100 or 102 buses.
U-995 was built by Blohm & Voss in Hamburg in 1943. The submarine was damaged in 1944 and spent the remainder of the war at a dock in Trondheim.
After the war it was commissioned by the Norwegian navy and was in service until the 60s, before ending up close to the Naval Memorial in Laboe and opening as a museum in 1972.