The Catacean Counter-attack begun with the invasion of the Dark Sea, which contained the Vortex's new hive. After being completely restored by Ecco, the Asterite summoned an army to aid Ecco in the invasion. Hundreds of dolphins swarmed the hive, attacking the various drones and Vortex creatures. This gave Ecco a chance to break into the new hive and commence the final confrontation with the Vortex Queen. After defeating her, the hive exploded, saving the oceans and the world. However, just as she exploded, a new creature emerged from the Vortex Queen which Ecco then chased to Atlantis...

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