Since Norsk Hydro was mentioned in the article, I have to mention in turn one of my favorite books ever: The Winter Fortress by Neil Bascomb. It's the true story of the Norwegian commando sabotage of the heavy water plant. Short version: after a failed attempt by the English, some locals who'd fled to England and received training parachuted in, blew it up, and then skied to neutral Sweden. Legends, the lot of them: they froze their balls off and didn't have enough to eat, but they pulled it off.
Every time I re-read it, it makes me want to take up nordic skiing. It is absolutely up there on my list of greatest true stories ever told with Touching the Void, The Emerald Mile, and a select few others.
https://www.abebooks.com/Winter-Fortress-Epic-Mission-Sabota...
That looks good; thanks. Growing up, I loved the firsthand account published in the 80s. Probably mentioned as a source in this newer book. https://www.goodreads.com/book/show/100634.Skis_Against_the_...
This story is also covered in The Bastard Brigade, which details many other Allied attempts to sabotage the Germany nuclear program. Fun fact: Heisenberg was close to being assassinated by a famous baseball player (Mo Berg). Very entertaining and interesting book.
Nordic skiing is great.
As a snowboarder I was reluctant, but got into it a few years ago. We pull our young daughter in a chariot with skis about 10km into a little cabin by a river with a wood stove.
Cheese, salami and hot chocolate and we make the return loop. Three evenings a week all winter long is a great way to spend time outside.
One of the Operation Gunnerside members was later part of the Kon-Tiki Expedition [1].
[1] https://en.wikipedia.org/wiki/Kon-Tiki_expedition