it's actually a moon base. the story goes that in the mid 70s, both the USSR and USA sent out two teams to declare the land theirs. however, since there was only one apparent landing spot, one of the teams had their rocket destroyed post landing. now that they have taken equal parts of the territory, a battle will be waged to see who can capture the enemy's land first and thus be the only team to get home.
sounds plausible, yeah?