In article om,
Dan Shackelford wrote:

Not to mention that the German nuclear program was crippled severely by
the lack of heavy water, thanks to sabotage efforts of Thor Heyerdahl
(later famous for his Kon-Tiki raft showing the Egyptians could have
sailed to the Americas)

Heyerdahl was in involved in stopping the production of heavy water at
Vemork?

I just finished reading about the German atom bomb effort, which
includes a lot about heavy water issues, and several Norwegians enter
the narrative, but Heyerdahl isn't one of them.