I presume you are near the end of cave/alien layer?
In the end part of the cave, lights go off, and then they come back on one by one. During this period the door on the other end is closed and aliens are moving around. You may have to fend them off aswell.
Once all lights have turned on, the door will open automatically and you will be sucked out of the mountain into the snowy terrain, which forms the next level.
I loved that level, one of the only truly 'alien' levels I've ever played in a game. As supposed to just human/humanoid architecture with brightly coloured walls or something like that.
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