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The Doomsday Project.

The Doomsday Project was Robotnik's ultimate weapon in world domination. It is a gigantic tower which was something Robotnik worked on since the coup. The pods which are made there can be deployed through systems of underground tunnels and can fire destructive energy beams. They are virtually indestructable. With the Deep Power Stones to run the dreaded machine, Robotnik would've been unstoppable, if not for Sonic and Sally, who used the stones themselves to destroy it.
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A doomsday pod.