Come on, that would be the PERFECT ending to this movie. 
Or any movie for that matter . . . 
According to the second, more detailed summary godzillatemple posted, the pyramid under the ice isn’t an Aztec pyramid, it predates the Aztec pyramids.
Funny, I just saw the teaser trailer posted at the Quicktime movie trailers page yesterday.
Click on the “behind the scenes featurette” to see the director talking about some storyboard art, among other things.