Oxygen Not Included · Duplicant skill · Digging
Hard Digging
Tier 1 skill that adds Excavation and enables mining very firm material.
How it works
The Standard Duplicant skills passage lists no prerequisites. Learning Hard Digging boosts Excavation by +2 and enables Very Firm Material mining. It is the first named skill in the digging progression shown; later digging entries list it among their prerequisites.
Read the supporting references
Named Standard Duplicant skills and base-game research facilities, limited to claims supported by the supplied evidence windows. The skills source may be outdated; the windows do not establish comparative effectiveness or exact skill point costs. Guidance explains the referenced mechanics; it is not a tested damage ranking. Check the stated edition and source version before applying a patch-specific detail.