Tunnel and underground

Introduction:

Added a building: an underground entrance, which can be used to access the underground. There are some minerals and special structures underground. If you install DLC or the following mods, more special structures will appear in the game Biomes! Caverns If you want to add some special structures to the underground, just make a custom map data,then add the "Underground" tag to it, and then put it into your own mod,When generating underground, data with "Underground" will be extracted for generation..

Credit:

Code:HaiLuan Art:aaaa椿 Welcome to join my discord