Floor 0502

Floor 0502 was a floor on a Mondasian colony ship. It served as the home of Nardole and the Mondasian refugees of Floor 0507's attack by the Cybermen following the evacuation of said floor, (TV: The Doctor Falls) as well as their descendants for hundreds of years. (PROSE: Twice Upon a Time)

Landscape and technology
Like Floor 0507, Floor 0502 served as a solar farm, albeit a smaller one, and had a windmill. It had cryogenic chambers containing livestock. Floor 0502's landscape was also very similar to that of Floor 0507 prior to the latter floor's destruction, resembling a spring countryside. The floor was highly sustainable for humanoid life, serving as the home of Nardole, the Mondasian refugees of Floor 0507 (TV: The Doctor Falls) and their descendants for centuries. (PROSE: Twice Upon a Time)

History
Shortly before the Battle of Floor 0507, the Twelfth Doctor explained to and  that he intended to evacuate the children and most of the adults of Floor 0507 to Floor 0502. During the battle, when the Cybermen retreated from their initial attack to prepare for a bigger assault, the Doctor ordered Nardole to lead the evacuation, stating that there would be enough livestock in the cryogenic chambers for everyone to survive; despite his reluctance to leave the Doctor to destroy the Cybermen, Nardole complied.

Just before the destruction of Floor 0507, Nardole and Hazran successfully evacuated with the other children, including Alit, to Floor 0502 via the lifts; Nardole later waited outside the lifts, sadly confirming to Alit that the Doctor and Bill Potts were not coming back from Floor 0507. Nardole then explained that the Doctor had destroyed most of the Cybermen, granting him "a while" to calculate another plan before the Cybermen remaining on Floor 1056 attacked again. Nardole then walked off with Alit and Gazron to have food with Hazran and the other children. (TV: The Doctor Falls) Following this, Nardole, somehow aware of Bill's survival, communicated with her via daily space-time telegraphs to 21st century Earth, whilst fighting the surviving Cybermen on a frequent basis. He had a barbecue with the children, and also broke his legs after falling nearly thirty feet down a service duct in a banana meadow, and had to be pushed around in a wheelbarrow by the children. (WC: The Best of Days) Nardole ultimately spent the rest of his life on Floor 0502, having six wives, two of whom he was married to at the same time, and reduced the Cybermen's attacks to annual Cybermat incursions every spring. (PROSE: Twice Upon a Time)