Hole lotta Tunnels#1596

Had an idea where caves could be connected via tunnels that players can go through. maybe they could connect to mines on the surface, allowing a quick run from caves to safety if your drillship is destroyed in the lower caves. maybe they go to a deeper cave level but being protected by cog defenses. perhaps these could change, opening or collapsing from time to time, from the volcanos rumblings and magmatic flows.