Enables/disables COG cave generation generate. This does not affect vanilla cave generator. COG Caves Very large veins intended for generating caves, supplementary to the vanilla cave generator. Note that these caves won't have lava or water springs, vines, or any of the other special features that the vanilla cave generator adds. Also note that hese caves won't replace water, to avoid carving huge holes in the ocean. Credit: based on feedback by dyrewulf from the MC forums. Don't match water