Just a note for clarity since I think it might have been lost in the long briefing post, but the facility is meant to be underground entirely. There are a few doors in and out. It has multiple floors. There are also long shafts that go from the outside of the mountain into a ventilation system. There wouldn't really be any sniping positions unless it is to shoot at enemies already outside of the facility. It would also be difficult for Kurt to teleport them, but they could have ways around that. There aren't many large, open spaces. It is all tight quarters with a lot of dark rooms and hallways that look similar.