well, growing qrtz looks nice... and powder toy isn't really much like real life...
why the hell does people still +1 growing qrtz...
growing quartz is cheating in my opinion, real-life bunkers can't grow either :/
The Stickmen died, but the bunker survived.
Just add a layer of soap in between the second or last layer of QRTZ, and that should be enough for defense against VIRS