Los Angeles Tunnel Collapse | All 31 Trapped Workers Rescued From Collapsed LA Tunnel All 31 construction workers who were far inside a huge industrial tunnel in Los Angeles made it to safety after a portion of it collapsed Wednesday evening, an outcome officials called a blessing after they initially feared much worse. The cave-in apparently happened between the tunnel boring machine, 5 miles (8 kilometers) in from the only entrance, and the construction crew working 6 miles (9.6 kilometers) in, said Michael Chee, spokesperson for the Los Angeles County Sanitation Districts, which is in charge of the nearly $700 million project.The workers were about 400 feet (121 meters) underground