UNSC Weather Station Z/41
From Halopedia, the Halo wiki
It is involved in taking glacier core samples from the ice below. The station has a Doppler radar facility for taking wind speed measurements, and includes a platform for aerial transport. Overhead, the Aurora Borealis can be seen flickering through the sky.
The station seems to be an abandoned drilling platform converted for use as a weather station, located near an ice shelf. It is divided into four "towers", labeled Maintenance, Communications, Barracks and Laboratory. The station was rumored to store alien lifeforms. The station served as the location for a War Games simulation.
List of appearances