Or send a soldier under hypnosis to distract, but that's even worse. Well, basically. I don't think it's impossible to break through from below.
Regarding the breakthrough. I think that in a 500-story skyscraper, many employees work, ready to defend the headquarters in case of an attack. And they are all probably already lying near the main entrance. And there are fewer of us).
Heroist, I've already done this, playing as Arnold.../