It's a sinkhole that is conservatively estimated at 10 feet around, but it was enough to cause the Bethlehem Fire Department to condemn seven homes at Blake Court.
"There was a water main break that caused the evacuation of these seven units," said Captain Allan Burghardt.
Fire officials say it's unknown if the water main leak or the sinkhole came first.
Regardless, crews have been working to fix the water main.
The people who live in the area had just an hour under the supervision of the fire department to grab what they could.
One resident says there were large cracks inside her home and fire officials say doors and windows in the middle units will not open due to shifting.
The Red Cross is providing the seven displaced families with financial help and a hotel room.
"Just trying to help them be comfortable and have a safe place to kind of figure out what to do next," said Peter Brown of the Red Cross.
It's unknown if or when the families will be allowed back into their homes to obtain the rest of their belongings. That decision will be made when all the work is done by a structural engineer.
No one was injured in the incident.