Lift shaft seven (The Daleks)
From Tardis Wiki, the free Doctor Who reference
Lift shaft seven was a lift shaft in the Dalek City on Skaro.
History
Ian Chesterton, inside a Dalek casing, led Susan Foreman, Barbara Wright, and the First Doctor to lift shaft seven. Once inside, they struggled to remove Ian from his casing, and the floor became magnetised, trapping Ian. (TV: The Daleks)