surface_dependency
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The terrors of the deep, toxic dust and gases, and the issue of underground oxygen—a perilous subterranean environment.
This is a structure that players can build themselves; it provides a release of pressure.
Physiological states added by this mod
This is a new survival method; it can even revive your friends in Hardcore mode.
The underground environment will deplete your oxygen, but perhaps you could build an oxygen chamber to live down there.