Hello. If you decided to read my guide, you probably want to find out what the secrets on the "Zombie Pods" map are or you want to remember / check what they are.
This map is the fourth map of the campaign. It's about destroying the "zombie pods"
Secrets are simply places on the maps that are not immediately available / visible (you need to e.g. walk into a wall or shoot at that place).
Have a nice reading.

Secret 1:

Above our starting point. You should shoot the wall.

Secret 2:

One of the shelves in the store (probably the fourth). You should shoot him.

Secret 3:

You have to enter this small room through the hole in the shelves.

Secret 4:

You must enter this room through the door.

Secret 5:

You must enter the hidden tunnel through the wall. (Top left corner of the boss parking lot)

It's not a secret but is very useful
There is usually a medic kit (first aid kit) in the lower right corner of the boss parking lot.

Polish version
List of my SAS guides
Thanks for reading!