No Tennyo, it doesn't have a chance in the world, that thing is like the GDI Ion Cannon from Command and Conquer.
Rock wall could work, if it's like sealing off the sewers, as the cannon wouldn't blast all the way down to the sewers, just gotta worry about it melting the manhole cover and the blast seeping in from there. So seal away at it Terra!
@Mumble, sure are, that one I can start at any time without messing any of my other plot arcs.
@Sarah/Satsu: Right away? I was planning a little something first, I shall PM so we can coordinate.