Somehow, I can't figure out how to open the exterior door of a UFO. I'm pretty sure this thing opens; I've seen enemies open it, and I've seen Youtubers open it. Nevertheless, the usual door-opening controls aren't working. I've tried clicking on the door, and I've tried pressing V, and neither worked. What am I doing wrong? Am I standing in the wrong position? Is this not a door? Am I missing some sort of door-opening technology? I'd experiment, but I'm on Ironman, and I'd rather not risk losing my soldiers to figure this out.