Ark Galactapedia

Uriel is the second planet from the neutron star in the unclaimed Oberon system. Before the formation of the United Nations of Earth (UNE), there were few regulations on the discovery of new systems. When Titania Terraforming won the coordinates of Oberon in an auction, they sold plots of land on Uriel to offset the future costs of terraforming the planet. However, the company failed to completely terraform the planet and stranded the newly-arrived colonists, who were forced to establish settlements underground in order to survive the cold and hostile world. Today, while there are some above-ground structures, the vast majority of people on Uriel live in a warren of interconnected, underground towns organized around familial lineages that can be traced back to the world's original settlers.