UN Callisto shipyards
A civilian shipyard in a crater on Jupiter's moon Callisto, run by Earth-based companies beside the Martian navy's yards and turning out plain single-purpose ships and no military hulls.
The UN Callisto shipyards are a civilian shipyard set in a crater on the surface of Callisto, a moon of Jupiter. They are the civilian twin to the Martian navy's yards next door, and the two share anti-asteroid defenses. Earth-based companies working in mining, transport and construction administer the yards, and lease space in the adjacent Martian orbital facility for work more easily done in zero gravity. Nothing military is built here. The ships that come out of Callisto are plain, built or retrofitted for a single task, with no thought given to how they look or how comfortable they are to live in.
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