Phoebe

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Phoebe is mined for its water ice, but for a more specific purpose than some of Saturn's other moons. Phoebe's ice contains approximately 8 times the level of heavy water compared to other bodies nearby, making it a good source of deuterium, which is used in Bactaran fusion-ion engines. Phoebe was used by the Bactarans to fuel their mining ships during the Expansion Era, and after Humans began using fusion-ion drives, they too began to use Phoebe this way.