Floor 1056

Floor 1056 was one of over a thousand decks on a Mondasian colony ship. The floor contained a hospital and various apartment blocks.

When the colony ship almost traversed into a black hole, each of the ship's floors was affected by time dilation. Located at the lowest end of the ship, time travelled more normally on Floor 1056 than on any of the floors above; 2 days and 10 hours on Floor 0000 equated to just over 1000 years for those on Floor 1056.

Colonisation
The ship was travelling from Mondas to pick up some colonists. On day 43, the ship almost traversed into a black hole. Twenty engineers, including chief engineer Franq, (PROSE: Jorj) were sent from Floor 0000 to Floor 1056 to reverse the rear thrusters. After completing their mission, the engineers found that they were unable to return to the flight deck, and so remained at the bottom.

Degradation
Due to their inability to return to Floor 0000, the engineers spent the rest of their lives on Floor 1056, eventually establishing an entire civilisation on the ship's bottom floor. Their descendants lived in a huge city, but as the centuries passed, the city degraded due to its close proximity to the ship's rear thrusters. A thousand years later, Floor 1056 had become unsustainable for human life, with most of its population living lives of poverty in ruined apartment blocks. (TV: World Enough and Time)

During the city's degradation, arrived on Floor 1056 (TV: The Doctor Falls) sometime after escaping Gallifrey. (TV: The End of Time) He attempted to escape the colony ship but flew his TARDIS too quickly in close proximity to the black hole, burning out his dematerialisation circuit in the process. The Master then "killed a lot of people, took over the city [and] lived like a king" until the people rebelled against him. Unable to escape, he adopted the disguise of "Razor" (TV: The Doctor Falls) and began working in the city's hospital.

Rise of the Mondasian Cybermen
Eventually, the hospital began Operation Exodus, a scheme with the intent of transforming the inhabitants of Floor 1056 into cyborgs that could survive not just in the city, but on the journey to Floor 0000, where the humans would take command of the ship. (TV: World Enough and Time) However, the Master manipulated the development of the operation to ensure that the cyborgs produced by Operation Exodus were a race of Cybermen, (TV: The Doctor Falls) with which the Master could conquer the galaxy. (PROSE: Alit in Underland) The "patients", an early evolution of Mondasian Cybermen, would not only escort people from the city to the hospital for Cyber-conversion, but would also travel to the higher floors to capture any remaining humans for conversion, as they did to the human crew members on Floor 0000. (TV: World Enough and Time, PROSE: Jorj)

Over the years, the technology grew more advanced and Bill soon became the first fully cybernetic humanoid. (TV: World Enough and Time) After the Twelfth Doctor altered the Master's controls to have the Cybermen convert two hearted beings as well as humans, they fought off the army of Mondasian Cybermen until Nardole collected them in a shuttle pod so they could evacuate. Over the next several hundred years, the Cybermen upgraded further, committing to Operation Exodus to eventually take control of the entire ship, sending numerous evolved models to higher floors to do so. (TV: The Doctor Falls)