The blast sent massive chunks of roadway flying, injuring two people. They were taken to area hospitals with minor injuries.
"An underground power transformer had exploded. The vault had come through the street and caused the debris to fly and that's what struck the individuals that were injured," said San Bernardino Fire Capt. Ben Alexander.
Crews worked through the night to repair the gaping crater on Waterman, measuring about 8 to 10 feet in diameter. As of Tuesday morning, the street was still closed off for construction.
The power was out for hours in the neighborhood, but has since been turned back on.
Just last week, three members of a San Bernardino family were killed after coming in contact with a high-voltage power line that fell in their back yard. SCE claims the two incidents were not related.