Mine Sweeper

The Mine Sweeper M314 Alta is a floating museum placed beneath the Akershus Fortress in Oslo.
The ship was launched in 1953 and served in the U.S. Navy as AMS-104 and in the Belgian Navy as BNS Arlon (M 915). In 1966, Alta was taken over by the Norwegian Navy. Decommissioning was in 1996 – after 30 years of service!