Dragonball Z - Hyperbolic Time Chamber Invisible Maintenence Crew?
When Goku and Gohan are first in the hyperbolic time chamber, Gohan is powering up because he thinks he can turn Super-Saiyajin. While powering up, a bunch of tiles break off the floor, hovering in the air. When that scene is over, the damage is never seen again.
on 03-30-2001 and