The top deck of the garage in Quincy, a suburb of Boston, partially collapsed underneath a large dump truck, breaking through and dropping the rear wheels of the truck below the surface.
No one was reported injured in the incident, but the building connected to the garage was evacuated by police.
The driver of the truck managed to get out but several cars are stuck in the garage.
"That's the problem, there's probably 11 on the top deck here that can't get out. There may be another 40 on this side of the dump truck that can't get out," Quincy Fire Department Deputy Chief Ed Fenby said.
The driver of the truck told police a cellphone GPS app directed him to the location, where the truck was simply too heavy for the garage.
"When you first pull into this lot, it doesn't look like a parking garage. So when you first pull in, it's like a regular lot...it's over the garage," witness Craig Croteau told Boston 25 News.
The driver told Boston 25 News he didn't want to speak on camera. He said he's doing OK, but still trying to process the harrowing afternoon.
The building is reportedly structurally sound, but police are asking people to stay away.