In the mirror universe, the Antares shipyards was a construction facility of the Imperial Starfleet of the Terran Empire during the 22nd century. The ISS Imperator was designed and built at the Antares shipyards, and soon after the ship's completion, the shipyards were the target of a massive attack by alien rebels, ensuring the Imperator would be the last ship of its class. (ENT - Mirror Universe novel: Age of the Empress)