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.

The Los Angeles Fire Department rushed to Wilmington after a tunnel collapsed and trapped at least 15 people inside. Authorities have not been able to contact the people trapped inside. The tunnel collapse appeared to damage communication lines.

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