Key Facts
- Heavy water removed by France
- 185 kg (408 lb) before German invasion
- Plant production capacity
- 1.2 tonnes of heavy water per year
- Vemork power station output
- 60 MW hydroelectric plant
- Key sabotage operation
- Operation Gunnerside, February 1943
- Final action
- Sinking of SF Hydro ferry on Lake Tinn
Strategic Narrative Overview
Between 1942 and 1944, the Allies executed a series of operations to neutralize Vemork. Operation Grouse placed a Norwegian advance team on the Hardanger Plateau in October 1942. Operation Freshman, a British glider assault the following month, ended in disaster when aircraft crashed and survivors were executed by the Gestapo. In February 1943, Operation Gunnerside succeeded when Norwegian commandos from Kompani Linge destroyed the production facility, followed by Allied bombing raids.
01 / The Origins
Following the German invasion of Norway on 9 April 1940, the Allies grew alarmed that Nazi Germany could exploit the Vemork hydroelectric plant — the world's first facility to mass-produce heavy water — to advance nuclear weapons development. Before the invasion, French intelligence had already removed 185 kilograms of heavy water, but the plant remained operational and capable of supplying deuterium to German atomic research programs.
03 / The Outcome
After combined sabotage and bombing forced the Germans to halt operations at Vemork, they attempted to transfer remaining heavy water stocks to Germany. Norwegian resistance forces intercepted this effort by sinking the SF Hydro ferry on Lake Tinn, destroying the last significant quantities of heavy water. These actions effectively ended Germany's practical ability to pursue heavy water-based nuclear reactor research for the remainder of the war.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Joachim Rønneberg, Knut Haukelid.
Side B
1 belligerent
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.