Operation Swallow: The Battle for Heavy Water

Operation Swallow: The Battle for Heavy Water (original title: Kampen om tungtvannet, French title: La Bataille de l'eau lourde) is a Norwegian-French film from 1948. The history is based on the best known commando raid in Norway during World War II, where the resistance group Norwegian Independent Company 1 destroyed the heavy water plant at Vemork in Telemark in February 1943.

The film is basically a reconstruction of real events, a docudrama, with many of the participants playing themselves in the film. It was filmed on location in Norway.

Cast
• Andreas Aabel as Kasper Idland

• Jens-Anton Poulsson as himself

• Johannes Eckhoff

• Arne Kjelstrup as himself

• Claus Helberg as himself

• Claus Wiese as Joachim Rønneberg

• Henki Kolstad as Einar Skinnarland

• Knut Haukelid as himself

• Fredrik Kayser as himself

• Hans Storhaug as himself

• Torstein Skinnarland as himself, the dam keeper

• Rolf Sørlie as himself

• Knut Lier-Hansen as himself

• David Knudsen

• Harald Schwenzen

• Raoul Dautry

• Frédéric Joliot-Curie

• Lew Kowarski

• Sigrid Gurie

• Øyvind Øyen as the professor, Major Leif Tronstad

Reception
It was the second most popular film at the French box office in 1948.