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Deep under Marcus Hook refinery, new importance for massive old caverns

Hundreds of feet beneath the former Sunoco refinery in Marcus Hook are five caverns carved from granite, excavated not by ancient geologic forces but by 20th-century miners.

The five caves were excavated between 1957 and 1973 for national security reasons. Special Collection Research Center, Temple University Libraries
The five caves were excavated between 1957 and 1973 for national security reasons. Special Collection Research Center, Temple University LibrariesRead more
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