"In this case a very good idea.  A pair of outer doors let me in; I suppose I was scanned first, although I didn't spot the scanner.  Through two more sets of automatic doors any one of which would slow down a raiding squad - then up a bounce tube.  Jubal, it wasn't an ordinary bounce tube.  It wasn't controlled by the passenger, but by someone out of sight.  More evidence that they wanted privacy and meant to have it - a raiding squad would need special climbing gear to get up that way.  No stairs anywhere.  Didn't feel like the ordinary bounce tube, either - frankly, I avoid them when I can; they make me queasy."