The elevator going up to the rest of the base from the loading dock goes 40-50 metres. There are four entrances, all going into the same lift.
GM: The doors open by a simple PIN number. In the early 19th century the Rubys don’t really have to worry about brute force cracking from anyone living there, so only four digits. In old school mobile keypad terms, the pass PIN is of course 7889 or R-U-B-Y. Anyone with access to late 20th or 21st century technology that has met the Rubys and their egos has a good chance of realising what this pin number might be.