Thirty-one men working in a massive underground tunnel in Los Angeles were rescued Wednesday night after a portion of the structure collapsed, officials said.

A large wastewater tunnel in Los Angeles collapsed during a construction project on Wednesday night, leading to the dramatic rescue of 31 workers trapped underground. All 31 laborers escaped without serious injuries. They were working near the section of the tunnel that caved in but narrowly avoided the collapse.

An industrial tunnel in Los Angeles collapsed partially. None of those rescued had major injuries, authorities said.