@TheCinesthetic Deep Canvas. I remember watching some of these scenes in dailies. Was a great mixture of traditional 2d animation over 3d environments.
My father was in the Marines and stationed on a Navy vessel during the crisis. Sadly, I forget the ship's name. However, since he was the best shot around, he was ordered to take up a high position with a rifle and target the Russian Captain on the ship they were side by side with. He said they were so close he could see the whites of the Captain's eye and took aim. He waited for the order to fire but it never came and was finally told to stand down. I clearly remember him musing how close that Russian Captain was to being killed and he never knew it. My father spent his life in the Marines and when he started opening up about his life's adventures, it blew my mind what that man lived through.