From Defiance Wiki
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Presidio Bunker is located underneath northwest San Francisco accessed through Presidio Station. The bunker extends deep underground and connects to a Terra-spire that crashed into surface near Fort Defiance.
The Earth Military Coalition built the bunker at some point before the Votans arrived. During the Pale Wars it was abandoned and later found by members of the Iron Demons who accessed the terra-spire from here. In 2046 Dark Matter took control of the bunker and used it to get to the terra-spire. (Main Mission:Defiance)