Episode Detail: Heavy Artillery - Junkyard Wars
The Green Team (the Hicks family) and the Yellow Team (the Washburn family) are challenged to build movable cannons capable of blowing apart a cinder-block wall, but the artillery must be made of junk. Experts advise both groups, and when the time to test the devices arrives, the teams are sequestered in a blast-proof bunker equipped with remote firing switches. It's a dramatic moment (especially since one expert is certain the Hicks' cannon will explode) that's followed by a surprising outcome.
