The story behind Hitler's plan of Germany getting the atomic bomb during WW2, and the heavy water sabotages in Rjukan, Norway, seen from four angles, the German side, the allied, the saboteurs and the company side.

Also known as Kampen om tungtvannet (original title) this is a remake of the 1948 Franco-Norwegian film of the same name & Operation Swallow: The Battle for Heavy Water. The 1965 British film The Heroes of Telemark, starring Kirk Douglas and Richard Harris, was another version of the story

The dialogue is in Norwegian, German, English and Danish with subtitles

Plot

Episode 1: Germany invades Norway and orders a doubling of production at the heavy water plant in Rjukan. Norwegian professor Leif Tronstad escapes to England to warn the Allies about what he believes is an effort to build a German atomic bomb.Tronstad establishes contact with the War Ministry and a plan to destroy the Hydro facilities is drawn up. In Rjukan, new managing director Erik Henriksen is confronted with sabotage of the heavy water facility. Operation Grouse is a disastrous failure.

Episode 2: The Americans insist on bombing the heavy water factory, but Tronstad persuades the Allies to send in a team of Norwegians instead. In Germany, Nobel Prize winner Werner Heisenberg promises a breakthrough in the development of a Nazi atomic bomb.Heisenberg is appointed director of the Kaiser Wilhelm Institute. The Gunnerside team succeeds in damaging the Hydro factory, but the Germans mount a major search for the saboteurs and order an immediate rebuilding of the heavy water facilities.

Episode 3: Werner Heisenberg must continue his research without heavy water. When they learn that the Germans are rebuilding the factory, the Americans decide to bomb it. The bombing causes minimal damage.The Germans decide to move heavy water production from Norway to Germany. The Allies order the remaining members of the Gunnerside team to sink the ferry carrying heavy water facilities across the lake from Rjukan.