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
Viewing post in Voices of the Void 0.7 feedback
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...