The San Francisco Fleet Yards are one of Starfleet's main construction facilities for its starships and actually dates back to way before the founding of Utopia Planitia.
Not only that, for many years, it was the only Starfleet construction dock and makes up not only ground factories but orbital drydocks where ships can undergo entire refits and repair as well as being constructed from the ground up. Err.. the space up.


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This Video is for critical purposes with commentary.