All 31 construction workers escaped safely after a Los Angeles wastewater tunnel partially collapsed 400 feet underground. Officials call it a blessing and praised the workers for keeping cool heads.

Recent advancements in tunnel boring machine (TBM) performance and optimisation have significantly enhanced the efficiency, safety, and sustainability of underground construction projects.

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.

Thirty-one construction workers 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… ...