Yeah, I'd bet the folks there are not feeling quite as comfy now as they would if it had concrete shell.
You'd have to imagine the baddies would need multiple shooters firing at the same point in quick succession to have any kind of shot of producing a breech though.
No concrete container? Sorry, Sax, cancel my last post.
When you consider the inherent inaccuracies of these rockets, there isn't a chance they could penetrate the shell.