Other source:
Goku and Gohan finally emerge from the Hyperbolic Time Chamber, and Trunks gets them up to speed on what's happening. They decide that in the nine remaining days until the Cell Games, Piccolo will go in the Chamber first, followed by Vegeta, and finally Trunks. Goku decides that he and Gohan don't need another period of training in the Chamber, and will finish their training outside. Goku confronts Cell to size him up.
