(Capcom's primary storyline)
Umbrella's Antarctic division operated as a research zone. Unbeknownst to the public, their experiments were a little more than just collecting core samples.
The only known facility within the Antarctic was the Antarctic Base, which was used for storage purposes. After Umbrella's downfall and the BSAA's reformation as a UN agency, the Antarctic division and its ruined facility was taken charge by the Oceanian division.