Floor 172 appears to be the other end of the sushi conveyor belt from Floor 169. Notably, many of the plates no longer hold sushi, but spent ammunition, field rations, dirty combat boots, and other such paraphernalia. As you watch from the elevator, a soldier emerges onto the conveyor belt, evidently quite happy with himself. His demeanor changes rapidly as a live grenade follows him onto the belt. The elevator closes after a green-tone rattlesnake enters onto the belt and immediately recoils upon seeing the grenade.