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Io Station was a United Nations Space Command military platform, believed to be in orbit around Io, the third largest moon of Jupiter.
Presumably, it picked up a communications fragment (located near Io) from the Prophet of Regret's fleet before it arrived in the Sol System. [1]
It contacted John-117 on the Forerunner Dreadnought before the Spartan contacted Cairo Station on Earth during the Second Battle of Earth.[2]