The Launch Bay is located within Gnomeregan, and lies beyond the tunnels leading from the Hall of Gears. It has one upper level and one lower level, both of which hold leper gnomes and their mechanical contraptions. The can be found on the central platform accessible from the upper level.
The Launch Bay has one tunnel leading from the upper level to a fork, where one can access the Engineering Labs' upper level, or the Launch Bay's lower level. The lower level leads via a tunnel containing a horde of Dark Iron dwarves, to the Tinkers' Court.