You can reinforce cave walls by adding a [[Support Beam]] to it. You cannot mine a reinforced tile, but it will prevent cave collapse.
== multiple Multiple tunnels ==
remind This is a reminder that the wurm Wurm world is a 2d 2D world and that all tiles are pillars. you can mine up and down but you <b>can't</b> make a tunnel above or below another tunnel. it is possible but it will make a big hole between the tunnels.
== Items required ==