Payload Bay

Atlantis' payload bay, being reconfigured for its next flight. The red tubes on either side are the robot arm and the new extension boom used for on-orbit inspection of the thermal protection system. The silver trapezoidal shapes just below the arm/boom are sill plates, used for mounting payload latches.

I saw Atlantis' payload bay twice (here, and in the depot in Palmdale during an overhaul), both times through plastic film like this.