It was a Navy base wayback that was used to clean nuclear warships and may or may not be radioactive.
"In April 2013, caesium-137 levels three times higher than previously recorded were found (the island hosted "radioactive ships from Bikini Atoll atomic tests and was a major education center training personnel for nuclear war"—the USS Pandemonium (PCDC-1) mockup had begun nuclear training in 1957."
"In April 2013, caesium-137 levels three times higher than previously recorded were found (the island hosted "radioactive ships from Bikini Atoll atomic tests and was a major education center training personnel for nuclear war"—the USS Pandemonium (PCDC-1) mockup had begun nuclear training in 1957."
https://en.m.wikipedia.org/wiki/Treasure_Island,_San_Francis...