[Sirius Lee]

Nothing new. Nazis and Soviets had these underground bases.

I'll bet we have undersea bases. I know we were experimenting in the 1960s using a deep lake in Utah as a test bed.

[DUMBGRUNT]

Point Sur is 600 feet of tough rock facing Pacific rollers that come 6,000 miles to pound the central California coast. Like the 19th-century lighthouse that marks the Point, the now-derelict compound of the former Naval Facility Point Sur evokes another era. And it evokes a mystery — one involving secret underground naval bases, high-tech submarines and Cold War nuclear brinkmanship. As late as the 1960s, Navy technicians and their families at Point Sur monitored undersea listening posts used to track Soviet subs. According to one legend, it wasn’t merely hydrophones the Navy ran from Point Sur, but submarines themselves based in giant man-made caverns dug into the rock. https://nationalinterest.org/blog/buzz/did-navy-plan-build-underwater-submarine-bases-battle-russia-84276