Apocalyptic

The year? Nobody cares about that now. The world is almost decimated! The air is toxic so now everyone has to mine for oxygen, from the chunks that fell from the moon. Run, RUN RUN! Your chest heaves as you finally find a (partially) suitable shelter to camp in. Air is running low and you have to find some more around the place. The thing is... there may be people, or at least remnants of them.