Presumably, the Battery Street Tunnel in Seattle, pictured here in a July 1954 photo from the Seattle Municipal Archives, passed the carbon monoxide test that the caption tells us the city was then conducting, otherwise we’d be looking at a rather grisly photo, something like in those post-apocalyptic movies where people attempt to flee their cities en masse. Then again, maybe this is just a photo from the beginning of the test and the Seattle Municipal Archives just chose not to upload the photos from the aftermath. Anyway, what do you see here?
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