Floor 000
From Tardis Wiki, the free Doctor Who reference
Floor Zero was the lowest level of Satellite Five. All the humans, who refused to believe the existence of the Daleks, hid there while Ninth Doctor worked and Jack Harkness and others fought above. Instead of proceeding up after initial entrance, as predicted, the Daleks instead went down directly to Floor Zero and exterminated all the humans. (TV: The Parting of the Ways)
