My friend worked at a company. The production was in the basement, well, they rented the neighboring basement. Inside, from their own in the second they broke the wall and put the door. And there was also an exit to the street, with a hollow wooden door. They thought, and sealed the wooden door from within.

And what do you think, next week, when they came to work, they found a broken wooden door.

I imagine how it was. Thieves break the door in anticipation of a large theft, and there is a wall.

P.S A clear example of the work of firewall'a. So you can absolutely any misunderstanding to explain how firewall works.

Quote 5 with a plus :D