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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). |