The Underground Tunnels are tunnels that you go through in PSA Mission 8: Mysterious Tremors. It was created by Herbert P. Bear using his Earthquake Driller. It can be accessed in PSA Mission 8: Mysterious Tremors from the Dock. If went correctly, it can lead you to the Boiler Room. These tunnels were dug for the purpose of causing buildings to be collapsed. As Herbert would drill under them, the foundation of the land would fall, and cause a lot of difficulty. This happened to the Gift Shop and the PSA agent would have to bring it back up. The agent would use a net, with spikes, and balloons filled with helium. Herbert also made a maze in there to confuse the PSA agent, if in the event he was being tracked.