Thirty-one people working in a massive underground tunnel in Los Angeles were rescued Wednesday night after a portion of the structure collapsed, officials said. Those rescued didn’t have any visible injuries,

The Los Angeles Fire Department rushed to Wilmington after a tunnel collapsed and trapped 27 people inside.Four other workers went in after the collapse to help the others. The construction workers inside the underground tunnel were rescued roughly an hour after the collapse,

The workers on Wednesday night were 400 feet underground and near the coast, as much as 6 miles away from the only entrance.