Eligius IV

Eligius IV is a mining ship and a space station previously owned by the Eligius Corporation. It was designed to be used for interstellar missions to mine asteroids or to search for habitable planets. The ship was built to house 500 people in indefinite cryo-stasis. As well as mining equipment, food to last for several weeks, a small water recycler, a dropship, and an assortment of weapons and military grade hardware for the guards. Including guns, missiles, and shock collars for inmates. It also has a fully equipped medical bay and a large long-term fuel supply.

On the side of the haul, it states "Powering a Better Tomorrow." This most likely refers to the prisoners mining a renewable source of energy to power utilities.

It is now a refuge for the sole survivors of the human race, who were originally planning on staying on the ship in stasis for a decade until the Earth would be habitable. However, when it was discovered Earth was now forever uninhabitable, Monty set the ship on a course for a new potential homeworld for humanity in another solar system before he died of old age after his wife. Which he discovered in the ship's computer files on the Eligius III mission after spending 30 years decrypting them.

History and Background
Sometime in the past, the Eligius Corporation sent out a mining mission into deep space with 300 prisoners, 25 guards and 12 crew members on board.

After a mutiny led by Charmaine Diyoza on April 4, 2047, that killed the captain and the crew of the ship and destroyed one of the engines. The mutineers decided to return to Earth, but with one less engine working, the journey home would take decades. Therefore, the prisoners were put into cryosleep, and in 2156, Eligius IV finally returned to Earth.

Throughout the Series
6 years after Praimfaya, the Gagarin (A dropship from Eligius IV) landed on Earth, carrying Charmaine Diyoza and 22 other prisoners.
 * -|Season Five=

On the Ark, John Murphy saw the station in the distance. Raven tried to radio the ship, but there was no response. As a quest to solve the group's fuel problems they flew to Eligius IV and found 284 prisoners in cryo-sleep. One of them, Kodiak, was woken up by Rankin to find out the reason the alarm was triggered and was killed by Bellamy and Echo. Later in order to have leverage over the prisoners already on the ground, Raven and Murphy stayed aboard to control the other prisoners still in cryo-sleep. In the interval between Pandora's Box and Shifting Sands, the leaders of Eligius prisoners took the remaining people from the ship and brought them back to Earth, including Raven Reyes and John Murphy, thereby leaving the ship abandoned.

After the Shallow Valley was destroyed, Wonkru, Spacekru, and the Eligius prisoners, along with Clarke and Madi Griffin, decides to go to Eligius IV, where they were put into cryo-sleep. However, Monty and Harper decided to stay awake, and they later have a son named Jordan Green, who was put into cryo-sleep at the age of mid 20's. Monty and Harper both died of old age, many years later.

In the year 2281, Jordan wakes up both Clarke and Bellamy, and shows them everything about him and his parents, and a new planet they can live on.
 * -|Season Six=

Location
The ship was built on Earth and in the 2040s it was launched to the asteroid Proxima 6, where it was based during its mission of mining Hythylodium. After the mutiny of the criminals, it was returned back to Earth orbit, where it was located all the time during the Battle for Eden.

Eligius IV is currently located in the orbit of Two-Sun Planet.

Alive
There were approx. 300 prisoners living on the ship, until they were woken from cyrosleep in Shifting Sands. Murphy and Raven also briefly stayed there, until they were brought to the ground with the prisoners.

In Season 5 finale, 412 of survivors including prisoners, Spacekru, and Wonkru went back on the ship and put themselves into cryosleep except Monty and Harper. 125 years later, Jordan Green woke Bellamy and Clarke on Monty’s order before both Monty and Harper died, due to old age. Which leaves 411 inhabitants on board.

Former Inhabitants
Those who left the ship to travel to the ground.

Deceased
Those who died on the ship.

Notes and Trivia

 * There are at least four spaceships owned by the Eligius Corporation.
 * Eligius I was an unmanned ship, Eligius II was a failed mission, Eligius III was sent to a new planet, and Eligius IV is a mining ship that used prisoners for manual labor on the asteroids.
 * The mission was supposed to be 24 years long