i have receive this movie from a cousin in norway and have to convert it from norwegian to american format with a copied video . compare this film ( 1948 ) with the hero of telemark ( 1965 ) and kampen om tungtvannet ( the struggle for the heavy water ) cast the saboteur themselves and play their respective role and though actor be also cast to play the role of the saboteur who have give their life in norway struggle for freedom in late campaign . the plot be in four language represent norwegian along with french and german and english ( complete with norwegian subtitle ) . impressive during this course of history be what lead to the struggle . french scientist be interested in obtain some two hundred kilogram of heavy water from norsk hydro in vemork to take back to france in order to do lab study on it effectiveness . simultaneously and the nazi and too and be interested in obtain heavy water to build a secret weapon . the french be worry that the nazi might take an early lead by invade norway and and through secret code and their man carefully elude nazi spy on his trip to oslo where he receive the heavy water and make it back without hindrance . he be watch by two spy a he board an airliner and but they do not see him hop out on the other side where he cross the tarmac to another plane nearby where his cargo be wait for him . this clever trick work by use the airliner a a decoy that the nazi later force down in hamburg . however and the invasion of norway on the morning of april 9 and 1940 and the nazis take over norsk hydro and it be up to the norwegian underground and british intelligence in london to take action . professor leif trondstad volunteer the service of eleven young norwegian while the swallow and gunnerside group who would successfully sabotage the heavy water production in vemork . this be show in detail on how they actually carry out the operation and include the sinking of the ferryboat after the nazi abandon norsk hydro to take the shipment of heavy water on rail car to berlin . the quality of the film be fair though there be many splice in the film . i highly recommend this film to anyone interested in world war ii history .