Eligius III

The Eligius III is a spaceship owned by the Eligius Corporation which originated from Earth. Its deep space mission, which started before the First Apocalypse, was to tap for oil on a far away Unnamed Planet, since Earth's resources had been virtually depleted.

Because their destination planet had two suns, its entire crew and all passengers on board were inoculated with Nightblood so they could better withstand the increased levels of radiation.

The current status of the ship, its crew and its mission, is as of yet unclear to the survivors aboard the Eligius IV. The ship is presumed to have arrived at its destination, however, due to the Nuclear Apocalypse wiping out most of Earth's population not long after its departure from Earth, this remains unverified. Whether any attempts to communicate back to Earth were made is also unknown.

Season Four
In The Tinder Box, Jackson indirectly refers to Eligius III by telling Abby that Becca first developed the Nightblood for the Eligius Mining Company to protect against solar radiation for long space missions.

Season Five
In Sleeping Giants, Miles Shaw mentions a ship called Eligius III which has Nightbloods on board.

In Pandora's Box, Raven shows Murphy a list of four Eligius-class ships.

In Damocles (Part 1), Eligius III was mentioned as Diyoza says that they weren't criminals.

In Damocles (Part 2), Monty reveals in his video message that Eligius III was sent to a new planet to tap for oil, since Earth's oil supplies had run out, which is the same planet the Eligius IV is now orbiting.