i'm not too sure about S-4, all seems to far fetched to me although i will keep an open mind on this one for now but a few things spring to mine
when i think of this place, one thing i think of is why didnt anyone see any type of construction going on, even tho its sposed to be underground we
would of still seen ALOT of activity above ground, construction workers, machinary, truck fulls of dirt being transported away, there would of
been tons upon tons of soil/rocks/sand ect, where did all the concrete come from or are they just sitting in a hole in the ground surounded by dirt
walls and floors
i think there could be a chance of something underground at A51 but it would be more like a basement, 1 or 2 levels at most and they'd probably use
it like we use our basements, fill it full of junk thats never gonna get used