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There are quite a few posts here, so I can repeat someone's idea, sorry. 

How about putting some cameras on the base from the start of the game? Install a pair on both floors and one on the street just so the player understands how they work. It would be fair to make them non-detachable from the walls (well, if possible) and give them different picture quality

There is one disabled camera from the start of the game near the main entrance with bad quality that you can enable, just noone notices that it is there until they will want to put a new camera in the same place. You can even see this camera on the radar

(+1)

Yes, I found it just yesterday! It's just a pity that it has such a bad quality, I can't see anything. The video quality, as for me, should be better and we need some more cameras inside the base. 

By the way, cameras work a little inconveniently in the sense that they do not appear in the camera list if they are disabled. I wish this could be fixed as soon as possible...