[Michael.SF.]

The tanks above ground are both storage and transfer tanks, and are relatively small in volume compared to the cavern storage facilities, which are enormous. But that is today, it may have been different in WWII, that I am not sure of.

I have sold equipment that is used for those underground facilities and until I did, I was unaware that they even existed.

[Robert A Cook PE]

The Pearl Harbor bombing, and loss of the Manila defenses so easily, quite properly scared hell out of the "armchair strategists" sitting in comfort in Pearl - and they made many changes between '41 and '44.

After '44, the built-in Pearl defenses and infrastructure) (largely already built) were relaxed somewhat, but converted after the war into "A-bomb" proof facilities where needed for comm gear, headquarters, etc when it became clear that Russia had the bomb and would likely use it first on Pearl and DC.