Jens-Anton Poulsson was the leader of "Operation Grouse", and one of those who made the sabotage raid against the Vermork heavy water plant successful. He always smoked pipe, could hunt reindeer, and made sure he and his three friends inside a hut got food while waiting for the rest of the troop. Previously growing up on Rjukan, he later started living at Hardangervidda where he lives as a low key mountain man who tells his unknown Tungtvann story.