...a rumor says that it was built for "supplying torpedoes for German uboats under ww2". A hatch was designed especially for torpedoes of the type ( not mentioned the type )... Later taken over by the Norwegian navy ( 1946 ? ) and used for duty in Northern Norway until ( unknown year ) the Noregian "Naval Home Guard" ( Sjøheimevernet ) usef her as a patrolboat until 1992...
Sorry folks, that is all that i know...