Sam Jewell: The following concept sketches pertain to the service tunnel ride. Please review this storyboard prior to reviewing these concept sketches.

The Service Tunnel Ride

RailCar

MovingCeiling
CarExit

The Car Exit

CarExit

This sketch shows how the spies will exit the mine car through a different door at the front of the left wall of the car.  They will push open a ramp which will be wheelchair accessible (going down at least) to exit.

At this point the jacks will have lowered the car so that the wheels are sitting on rails, and the jacks are hidden behind the wheels.

The tunnel they have just ‘travelled down’ will be in darkness so they can’t see how short it is.  Alternatively a painted canvas could come down to obscure the view, or smoke could be used (or a combination).
The related storyboards can be found at the storyboard main page.