A build-up of hydrogen gas in a forgotten power cable is the probable cause of a mysterious explosion that happened earlier this month at a Rhode Island beach.

Officials said the long abandoned cable had originally been laid by the U.S. Coast Guard at Salty Brine Beach in Narragansett.

The July 11th explosion from under the sand tossed a 60-year-old Connecticut woman ten feet into the air.

She suffered two cracked ribs and a concussion.  Officials say there is no further danger to summer beach goers. (Metro Networks Inc.)

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