None of the 31 construction workers rescued in the tunnel sustained visible injuries, according to LAFD. Firefighters said construction workers climbed over a roughly 12 to 15-foot pile of dirt to escape.

There was one entry point to the 18-foot wastewater tunnel that some 31 people were working in late on Wednesday night, per the LA fire department.

As many as 15 workers were trapped in an industrial tunnel collapse in Los Angeles' Wilmington area, the city's fire department said. No injuries have been confirmed, according to the Los Angeles Fire Department (LAFD).