When I first became fascinated with WDW, one of the first factoids I learned was that SSE is actually split into two: an inner and outer layer. The inner sphere holds the actual attraction itself, and has its own shell enclosing it. Extended about
a foot three feet (thanks Raven) from this inner sphere is the outer sphere which holds the shiny Alucobond tiles cladding the outside of the structure. In between these two structures is a small area big enough for cast and crew to travel for various maintenance to the attraction, and for things like utilities. Yesterday I finally stumbled upon a video of this space between the two parts and thought I would share it with you all! If you've already seen it, kudos (why didn't you tell me about it)!