Echo Mine

Echo Mine is a location that appears in the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing. It is an abandoned Eggman Empire mining base located deep underground.

Description
The entrance to Echo Mine is in a cave in a mountainous area. The entrance itself to this cave is carved out so that it resembles Dr. Eggman's face. Inside this cave is a mining shaft with an elevator platform (which has since been destroyed) that lead deep into the ground. On the bottom of this shaft, it connects to a network of winding mining tunnels held up by old-fashion wooden support beams and with tracks for Eggman Empire-emblazoned minecarts leading through them. Because most of the tunnels have no lights illuminating them, most of the Echo Mine is draped in darkness, making it impossible for speedsters like Sonic to run around safely.

Past
During the the War between the Eggman Empire and the Resistance, Echo Mine was apparently a place where several people were being held imprisoned by the Eggman Empire. Before Sonic came back to them, the Resistance launched one of their biggest counterattacks against Dr. Eggman's forces right here in Echo Mine. While the Resistance was succesful in liberating a lot of people that day however, they lost a lot of good people too.

Infection
After the War, Sonic and Amy came to Echo Mine in order to access the Eggnet on the Eggman computer that lay in the mines. Upon finding it, Amy was able to restore power to the room and the room. She was also able to hack into the Eggnet. While on Eggman's network, Amy found files on an ARK-like space station and talk about "payload distribution". Before Amy could learn more however, the computer was destroyed by a tank with a massive drill and guns, which was piloted by Rough and Tumble. The brothers tried to make their typical rhymey introduction, but Sonic pointed out that it they did not rhyme well. As Rough and Tumble began to argue, Amy tried to destroy the tank's drill with her Piko Hammer, but it proved too solid. Sonic thus took Amy through the mines until they reached a refuse pit, and they decided to use the narrow floor in the cave to defeat Rough and Tumble. When Rough and Tumble arrived and were forced to follow the narrow floor, Sonic brought Amy in from to the rear of the tank. He then threw Amy up to the tank's cockpit, which she destroyed while Sonic hit the tank's treads. The tank subsequently fell into the refuse pit, but Rough and Tumble escaped and activated their backup backpacks. This made a metallic liquid gush over them and turn them into Zombots. Sonic and Amy proceeded to engage Rough and Tumble, only for the Zombot brothers to instantly regenerate from any damage they got. Eventually, Sonic got rid of both Zombots by knocking them into the refuse pit. However, in the process, Sonic got infected with what had transformed Rough and Tumble into Zombots.

Points of interest
There are at least two significant locations in Echo Mine:
 * Central hub cave: A large cave that serve as the central hub for Echo Mine. This cave holds a network of connecting rails and a power generator for the entire mine. Also, unlike most other places in the mine, this cave is fully illuminated. This cave also once hosted a large computer terminal that granted access to the Eggnet (until it was destroyed by Rough and Tumble ).
 * Refuse pit cave: A cave with a large refuse pit in the middle. It has a narrow floor leading around the pit and only a single way in and out of this cave.