Actually, I don't think what they are doing is all that special.
I have ferried helicopters back and forth between various South American countries and Canada and lots of Canadian pilots, including myself, have spent considerable time flying in the Arctic. In my case, right up past the most northerly point of North America.
The ferry flights only required a fairly current set of Jepps and a huge bag of US dollars (no credit cards accepted south of the Rio Grande).
Flying in the Arctic is not rocket science either, no matter what some guys would like everyone to believe. With a little instruction and lots of caution they shouldn't have any problem, especially with the back up they have.