It was such a gnarly event, that even the New York Times covered the story - click to enlarge
click to enlarge
click to enlarge
In Seattle's tree-lined (at least it seems tree-lined to me, a boy from the logged-off Ballard forest) Ravenna neighborhood, a massive sinkhole opened up in November, 1957, and threatened to suck the whole neighborhood down to the 145 foot deep sewer tunnel buried below.
These photographs are courtesy of the Seattle Municipal Archives. At the time, this was the biggest sinkhole, ever in the United States. You can read more about it here.
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