Floor 1056

After being shot through the chest, Bill Potts was taken to Floor 1056 of the Mondasian Colony Ship to be "repaired".

It was the lowest floor on the ship and thus the furthest away from the Black hole that the ship was slowly moving away from. As a result, time on this floor moved at a normal rate compared to Floor 0, where time moved so slowly that it appeared to those on Floor 1056 that there was no movement at all; 10 minutes at the top equated to years for those on floor 1056. (TV: World Enough and Time)

History
After 20 members of the initial crew on the ship went down to reverse the thrusters away from the black hole, the time differential cause the residents to age so much that they soon gave birth to several generations. A hospital was setup at some point, where the residents all inevitably went to be converted to preserved there lifespan. joined the residents at some point, acting as caretaker to the hospital under the guise of "Razor". After an attempt to send a group back up proved unsuccessful, the staff at the hospital created "Project Exodus", a plan to convert everyone in to cybernetic humanoids so they could survive the journey upstairs. The prototypes would go to the upper levels to collect any remaining humans to take downstairs and eventually convert them.

Behind the Scenes
The numbers of the floor equate to 12 when added together, a reference to the starring Doctor.