So you probably don't need thousands, you probably need on the order of several 10's or so to get through once. And the underbomber's gang will get, supposing

So you probably don't need thousands, you probably need on the order of several 10's or so to get through once. And the underbomber's gang will get, supposing that they can try repeatedly - what? - Three goes tops before the hammer comes down on them.