Siberia is a section of the Soviet Union. It is a location known for it's cold winters and harsh conditions. Several previous governments that controlled the region used it as a place to send prisoners or unwanted citizens.
Issac Barnes believed that a Soviet Army base located in Siberia was used to coordinate the secret weapons program known Project Omega and a possible invasion of Khios. He requested that UNITY send Cate Archer to this base to investigate.
Siberia was also home to the Siberian Hockey League.
Siberia on Wikipedia