The bunker was like a maze – they kept passing through heavy steel doors that Yuri had to open with a code, retinal scan, and thumbprint, which took up time. They passed other scientists and armed guards, and Yuri exchanged greetings in Russian, smiled and laughed rather dazedly with his colleagues, nodded to the soldiers. Hermione's pulse was racing and her fingers were cramping around her wand. She didn't know why infiltrating a Muggle base seemed worse than fighting Death Eaters, but something instinctive and irrational in her mind obviously didn't like the dissonant clash of the magical and Muggle worlds.