An entire construction crew was rescued after a tunnel partially collapsed and trapped them late Wednesday in Los Angeles.

The crew of 31 were approximately 400 feet underground inside the industrial tunnel that caved in as they worked on the $700 million project, the Associated Press (AP) reported.

Los Angeles County Sanitation Districts spokesperson Michael Chee said the incident happened between the boring machine that is located five miles inside the tunnel and the crew. The AP article continued:

The tunnel is being constructed almost entirely underneath public right-of-way. The structure is 18 feet (5.5 meters) wide and will be 7 miles (11.3 kilometers) long to carry treated wastewater from across Los Angeles County to the Pacific Ocean.

Firefighters said workers had to climb ov

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