Colony ship (World Enough and Time)

A colony ship was travelling from Mondas to pick up colonists. When the ship almost traversed into a black hole, the crew experienced the effects of time dilation, where time on the lowest decks of the ship was travelling faster than on the upper decks.

Layout
The ship was approximately 400 miles long and around 100 miles wide.

Decks
The ship contained over a thousand decks, each of which presented a Mondasian environment. These included:
 * 0 - The main control deck.
 * 507 - A deck containing the largest of the ship's solar farms.
 * 1056 - An urban deck, containing various apartment blocks and a hospital.
 * Other floors mentioned on the lift scanner are: 1052, 1051, 1050, 1049, 1048, 1047, 1046, 1045, 1044, 1043, 1042, 1041, 1040, 1039, 1038, 1037, 1036, 1035, 1034, 1033, 1032, 1031, 1030, 1029, 1028, 1027, 1026, 1025, 1024, 1023, 1022, 1021, 1020, 1019, 1018, 1017, 1016, 1015, 0951, 0950, 0949, 0948, 0947, 0946, 0945, 0944, 0943, 0942, 0941, 0940, 0939, 0938, 0937, 0936, 0935, 0934, 0933, 0932, 0931, 0930, 0929, 0928, 0927, 0926, 0925, 0924, 0923, 0922, 0921, 0920, 0919, 0918, 0917, 0916, 0915, 0914, 0913, 0912, 0911, 0910, 0909, 0908, 0907, 0906, 0905, 0904, 0903, 0902, 0901, 0900, 0899, 0898, 0897, 0896, 0895, 0894, 0893, 0892, 0891, 0890, 0889, 0888, 0887, 0886, 0885, 0884, 0737, 0736, 0735, 0734, 0733, 0732, 0731, 0730, 0729, 0728, 0727, 0726, 0725, 0724, 0723, 0722, 0721, 0720, 0719, 0718, 0717, 0716, 0715, 0714, 0713, 0712, 1711, 0710, 0709, 0708, 0707, 0706, 0705, 0704, 0703, 0702, 0701, 0700, 0699, 0698, 0697, 0696, 0695, 0694, 0693, 0692, 0691, 0690, 0689, 0688, 0687, 0686, 0685, 0684, 0683, 0682, 0681, 0680, 0679, 0668, 0667, 0666, 0665, 0664, 0663, 0662, 0661, 0660, 0659, 0658, 0657, 0656, 0655, 0654, 0653, 0652, 0651, 0650, 0649, 0648, 0647, 0646, 0645, 0644, 0643, 0493, 0492, 0491, 0490, 0489, 0488, 0487, 0486, 0485, 0484, 0483, 0482, 0481, 0480, 0479, 0478, 0477, 0476, 0475, 0474, 0473, 0472, 0031, 0030, 0029, 0028, 0027, 0010, 0009, 0008 and 0007.
 * Other floors mentioned on the lift level indicator are: 0995, 0994, 0993, 0992, 0991, 0990, 0989, 0988, 0987, 0986, 0985, 0984, 0983, 0982, 0981, 0980, 0979, 0978, 0977, 0976, 0975, 0974, 0973, 0972, 0971, 0970, 0969, 0968, 0967, 0966, 0965, 0964, 0963, 0962, 0961, 0960, 0959, 0958, 0957, 0956, 0955, 0954, 0953, 0952, 0363, 0362, 0361, 0360, 0359, 0358, 0357, 0356, 0355, 0354, 0353, 0352, 0351, 0350, 0349, 0348, 0347, 0048, 0047, 0046, 0045, 0044, 0043, 0027, 0026, 0025, 0024, 0006, 0002 and 0001.

Each level from the bottom and up would move a little slower than the one below it due to the black hole.

Crew
At take off, there were fifty crew members aboard the ship. They included Jorj: a member of janitorial staff. Following the effects of time dilation, the ship became filled with generations of lifeforms, each descended from the ship's crew.

Technology
The ship was fitted with super-fast inertia lifts and was propelled by rear thrusters. Aboard the lowest decks, evolution of technology was advanced. In order to adapt to expiring environments, an artificial evolution was devised. The Mondasian inhabitants were gradually upgraded into Cybermen. (TV: World Enough and Time)

History
The colony ship was commissioned to transfer residents of Mondas, with a skeleton crew of 50, including the janitor Jorj, set to pilot it there to prepare for such. However, they became sucked into the orbit of a black hole, 20 members speedily going down to Floor 1056 to reverse the thrusters to pull away from the black hole. However, due to the nature of the gravitational pull caused by the black hole, it created a sense of time dilation, effectively creating several time zones, with the lower floors moving much faster while the higher floors, notably floor 0, moved extremely slowly in comparison. The lower floors implemented clocks to monitor this difference, noting how 2 days passed at the top but over 1000 years did likewise on floor 1056.

Due to such, the lower floors inevitably gave birth to several generations as their floors decayed drastically, forcing them to convert themselves into cybernetic humanoids to survive. At some point snuck on board and lived on floor 1056 as "Mr. Razor", the caretaker of the hospital people went to be upgraded. The prototypes would venture to the upper floors to take the rest of the crew members for conversion, leaving only Jorj as he wasn't completely human.

Eventually, the Twelfth Doctor,, Bill Potts and Nardole picked up Jorj's distress signal. (TV: World Enough and Time)