The technologically-advanced city thrived on the mainland until roughly 600 years ago when the two scientists Jordann and Kayla-La discovered the White Comet that would soon impact directly on the city. Desperate to save their home, Kayla-La developed and proposed a plan to physically move the city out of harm's way using the power of Chaos Emeralds. After excavating twelve of the rare and powerful gems, the Chaos Chamber was established to harness the energy of the emeralds. After the Fire Ants dug under the foundations of the city, separating it from the planet's surface, Echidnaopolis lifted into the sky, becoming the Floating Island. A large crater marks its former place in Downunda. (StH: #34, #82, KtE: #10)