Hyper
bolic time chamber is a place where time bends one year in there is like only a
day outside the hyperbolic time chamber and you could only use it twice who ever
goes in there more than three time may be stuck forever and there is only one
door to leave that place in the majin buu saga piccolo had no choice but to
destroy the door when gotenks was joking that he couldn't beat Majin buu and
threre was no way out until majin buu got very angry and made a whole in the
dimension and got out then gotenks turned super saiyan 3 and opened the same
portal that majin buu did.