Question: Claus Helberg (31 January 1919 – 6 March 2003) was a Norwegian resistance fighter and mountain guide,  was a member of Company Linge, a resistance commando unit that was best known for carrying out, during World War II, which titled series of operations undertaken by Norwegian saboteurs during World War II to prevent the German nuclear weapon project from acquiring heavy water (deuterium oxide), which could have been used by the Germans to produce nuclear weapons?
Sentence (from "Girdler sulfide process"): The Girdler sulfide (GS) process, also known as the GeibSpevack (GS) process, is an industrial production method for filtering out of natural water the heavy water (deuterium oxide = DO) which is used in particle research, in Deuterium NMR spectroscopy, deuterated solvents for proton NMR spectroscopy, in heavy water nuclear reactors (as a coolant and moderator) and in deuterated drugs.
Relevant evidence: No