[SubMareener]

There is a Clive Cussler novel in there somewhere! ;-) It begins 14 Million years ago in an alien outpost in tropical Antarctica. The deadly pathogens are contained and the aliens plunge the planet into an ice age to seal them for ever. But...

[Eye of Unk]

I read that book some years ago, I’ll have to dig it out.

I bet they find something interesting, very interesting.

[Hillarys Gate Cult]

Or the entire planet will deflate and fizzle like putting a hole in a giant balloon.

[null and void]

“Who goes there?” John W. Campbell, Jr. 1938 (under the pen name Don A. Stuart).

You might know it better from the movies made from it:

The Thing from Another World (1951, Howard Hawks)
The Thing (1982, John Carpenter).