Sorrens served in Sierra-One under the command of Sgt.Bernadette Mataki. He and the rest of his squad took part in the Assault on Landown. They proceeded to fight through the Hollow, making their way back to the surface, with everyone in the squad being killed except for him and Bernie. As they reached the surface, the Hollow began to flood, and they reached Jacinto, only to miss their RV point. As the city sank into the sea, Sorrens and Bernie became separated, and it is assumed he drowned.