The Echo Mine, also referred to as the Egg 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.
The entrance to the 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 leads deep into the ground. On the bottom of this shaft, it connects to a network of winding and narrow 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. In addition, the whole mine is equipped with surveillance cameras.
The Eggman War
During the war between the Eggman Empire and the Resistance, but before Sonic came back to them, the Resistance launched one of their biggest counterattacks against Dr. Eggman's forces in the Echo Mine. While the Resistance was successful in liberating a lot of people that day, they lost a lot of good people as well.
Infection and Big's Big Adventure
After the Eggman War, Sonic and Amy came to the 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 and hack into the Eggnet. There, Amy found files on an ARK-like space station and talk about "payload distribution". However, before Amy could learn more, the computer was destroyed by a tank with a massive drill and guns, which was piloted by Rough and Tumble. Pursued by Rough and Tumble, Sonic took Amy through the mines until they reached a refuse pit, and they decided to use the narrow floor in the cave to defeat the skunks. When Rough and Tumble arrived and were forced to follow the narrow floor, Sonic and Amy got the tank to fall into the refuse pit. Rough and Tumble managed to escape and activated their back-up backpacks. This made a metallic liquid gush over them and turn them into Zombots. Unable to injure the Zombot skunks, Sonic got rid of them by knocking them into the refuse pit. However, Sonic was infected with what had transformed Rough and Tumble into Zombots in the process. Meanwhile, Dr. Eggman and Dr. Starline observed everything through the cameras in the mine.
Later on, Big came to Echo Mine to look for Froggy. He thought he had heard Rough and Tumble's voices but did not see them. He looked into the refuse pit but still saw nothing. Unbeknownst to him, the skunk brothers stared straight up out of the pit.
Out of the Blue
After the infectious substance―known as the Metal Virus―was destroyed by Super Sonic and Super Silver, all who had turned into Zombots reverted back to normal. However, Rough and Tumble remained trapped in Echo Mine after being cured, unable to get out of the refuse pit. Sometime after the end of the plague, Rough and Tumble were rescued by Tails and Tangle, the latter of whom pulled the skunk brothers out of the refuse pit using her tail. After rejecting and laughing at Tangle's offer of redemption for their previous misdeeds, Rough and Tumble ran off, excited to run wild in the world again. However, the duo found difficulty in finding a way out of the mine. Meanwhile, Tangle asked Tails how he was feeling in the absence of Sonic, who had vanished without a trace after the Metal Virus' destruction. Tails insisted he was fine, believing they would see Sonic again. After Tails stated that it would be up to them to keep the peace, Tangle called him aces and invited him to a party in Spiral Hill Village.
Points of interest
There are at least two significant locations in the Echo Mine:
- Central hub cave: A large cave that serve as the central hub for the 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.