much as depicted earlier in concept
art, these are several (seven or more) asteroid bases in a dusty, asteroid
strewn level in the single-player campaign.
somewhat different concept
art referred to the asteroid base as "Gehenna".
bases are Vaygr archeological dig sites, as Makaan's forces
try to find the Oracle, an artifact that can help them to
unlock the secrets of the ancient Progenitors.
biblical reference: Gehenna was the Hebrew "Place of
Torment." The Valley of Hinnom, south-west of
Jerusalem, where Solomon, king of Israel, built "a high
place", or place of worship, for the gods Chemosh and
Moloch. The valley came to be regarded as a place of
abomination because some of the Israelites sacrificed their
children to Moloch there. In a later period it was made a
refuse dump and perpetual fires were maintained there to
prevent pestilence. Thus, in the New Testament, Gehenna
became synonymous with hell.