Secure small entry points

The following pictures were shot in Austria. It's all about getting entry through a small leakage. As you can see in the next picture this is the back side of a police station. These doors are the entry to the police cars of this station.

Unfortunately, you can't see the switch for opening the main gates in this picture. It's a little more on the left side, just between the entrance to the police station itself and the door to be openend.

Although the attacker isn't able to get through this hole herself, she just would need to dismount the outer and the inner grid of this leakage and pull the switch to open the main gates with the help of some experienced tools like a stick. 

Please, also look at small leakages when you are doing an assessment or planning the security of a building.