Sewers ^{Version 1.7.3}

This plugin generates tunnels, pits, fallout shelters, sinkholes, sewers, manholes and more in overworld. It was originally made for CB1337 and it wasn't working under CB1060 because the plugin was trying to generate blocks that didn't exist in 1.7.3, I was able to backport the plugin to 1060 by replacing those 1.8.1 blocks with 1.7.3 blocks.

Original Plugin: https://dev.bukkit.org/projects/sewers