Sphere 911 was a Borg tactical sphere built by the Borg Collective to serve as the flagship of a fleet meant to engage the Lyran Star Empire in 2385. With the help of the RIS Bouteina, a tactical wing from Lyran Starfleet, under the command of Senior commodore Pfrizzek, defeated that fleet during the Battle of Krypton; however, only a pair of phased plasma torpedoes was able to destroy the flagship. (RIS Bouteina: "Sphere of Influence")

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