[b4me]

30 ft tall is pretty big, i think.

i just wonder how easy it is to rig up rope ladders or such to this skinny walls and still get over them.

I just hope these can withstand cannon blast type stuff, truly impenetrable.

I read elsewhere some one mentioned a kill fence. first time you get zapped and fall down next touch much worse. I wonder what other surveillance or such would go with these skinny walls?

[Aria]

concrete can be cut.