Surveillance video captured the shocking moment the road folded beneath the SEPTA bus in Philadelphia's Hunting Park ...

"I am concerned about the mud intrusion in there again from whatever this was, happening somewhere else," said Tom Dinaro, a resident of the Regis building.

A section of North 6th Street near Rising Sun Avenue in the Hunting Park neighborhood has been closed while repairs are made.

The couple went viral after showing how they found a building they had no idea they owned hidden in their backyard.