Normally what you do is that you start with three tanks and you would use replication and you computer generate the other tanks,.. But here, they were so available I could use real tanks. It was cheaper to get real tanks in the Czech Republic than to make the fake ones that I would normally use computer generated imagery to do. In fact, we had to call NATO and warn them about that scene, because it looked like a weapons build-up in the Czech Republic.
Andrew Niccol