The End of the World As We Know It

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And my first thought watching this is, "The guys watching this from the International Space Station must not be happy."

What do you do when you're in a small space station and an asteroid destroys your entire planet, but not you? There's a story in that.

My second thought was, "What survives?"

Sure, everything on the surface is gone, but some caves run nice and deep and not everything living down there needs oxygen. Actually, quite a few barophilic bacteria (pressure loving bacteria for those who failed Latin) are anaerobic. Other bacteria thrive on extreme temperatures. So only higher life forms evolved to need oxygen would die out.

Could you rig something to convert the gas output of some of those heat-happy bacteria to oxygen to keep an astronaut alive?

My husband says I'm a geek for even wondering. What do you think?