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This mod adds a vacuum when you exceed a certain elevation which will suffocate you. To combat the lack of breathable atmosphere there are air pumps, if you are below the unbreathable atmosphere you can fill steel bottles with air, and above the atmosphere you can pump the air out of the bottles.

It's possible to use Pipeworks and Mesecons with the air pumps to create automated systems.

More mods by this modder

It doesn't look like I've reviewed any other mods by this author, feel free to suggest one.