Underground Workshops Idea ID
The add_ideas ID for Underground Workshops in Hearts of Iron IV is MAN_underground_gun_shops.
Underground Workshops
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Add this idea with the add_ideas command and the idea ID MAN_underground_gun_shops.
About this idea
We have created a number of makeshift workshops in backyards and cellars to produce more equipment. The quality is perhaps not as great, but they make up for it in numbers.