From the very beginning until the end you do not know who "the enemy" is. That is all they are ever called. This drove me crazy. Next, if you are on an extremely important mission, people must trust each other. A common theme movies use is not quite trustworthy people. Then why are they on a top secret mission? Just my pet peeve. I liked the story of getting across enemy territory skating on the ice. That was different. I felt the plot was so one dimensional. There were no surprises, no twists, no aliens!. It was listed as a sci fi by Netflix. I was hoping for better.