Republic City tunnel network

The Republic City tunnel network is a system of subterranean passages located underneath Republic City. It is a heavily complex network of tunnels heavily utilized by the Equalists as base for their many underground operations.

History
Following their search of the Sato estate for proof of Hiroshi Sato's involvement with the Equalists, a search team consisting of then Chief Lin Beifong, Avatar Korra, Tenzin and several police officers searched inside Hiroshi's backyard workshop. Using seismic sense, Lin discovered a secret tunnel leading from Hiroshi's workshop to a secret underground factory, where Hiroshi manufactured Equalist weaponry, including mecha tanks. The majority of the search party escaped the factory following a battle with the mecha tanks, apart from Lin's metalbending officers who were taken to Amon and later transferred to an Equalist prison underground.

Following Avatar Korra's abduction several days later, Lin proposed to search underground in the maze of Republic City's tunnel system for signs of Korra, along with her officers. Using her earthbending and metalbending, Lin, along with Tenzin and Team Avatar (sans Korra), navigated through the tunnel system and eventually arrived at the prison facility, where Lin was able to free her officers. It is here that the group also discovered that the Equalists did not attack City Hall and take Korra, and that Tarrlok was the one behind the whole incident.

Description
Upon first glance, Republic City's underground tunnel system seems to be largely unused. However, due to growing unrest among the citizens of Republic City, it has been the primary site of operations for Equalist activity.



The tunnels themselves are used by Equalists as tracks for their vehicles, particularly transport trucks and motorcycles. Secret doors and entrances are located throughout the network, rigged to open following the flick of a switch. These passages lead directly to junctions where Equalist weaponry and equipment are stationed.

The dock junctions also feature a complex rail system which branch off into several Equalist compounds. Few Equalists are stationed at each junction and oversee where arriving cargo or reinforcements are deployed.

Equalist factory


The Equalist factory is an Equalist weapons foundry located beneath Hiroshi Sato's personal workshop in the backyard of his mansion.

Equalist prison
Following their abduction, apprehended benders are taken to a large subterranean prison facility. Equalists man the halls of the prisons, if ever a breach occurred. This is where Lin Beifong found her metalbending officers following their capture and the removal of their bending abilities.

Equalist training facility
The Equalist training facility is where new recruits are trained in the art of chi blocking and combative maneuvers. Several of the train carts carrying supplies lead to the training grounds.

Trivia

 * Many of the facilities built within the tunnel are hidden and largely undetectable unless seismic sense is used.