Key Facts
• On July 9, 2025, a tunnel under construction collapsed in Los Angeles.
• 31 male workers were temporarily trapped 120 meters underground.
• The collapse occurred without warning, 8 kilometers from the tunnel’s only entrance.
• The tunnel, part of a sewage project, measures 5.5 meters wide and 11 kilometers long.
• Over 100 Los Angeles Fire Department personnel and urban rescue teams responded.
• All workers were rescued safely with no significant injuries reported.
• Workers had to traverse the collapse site on foot to reach vehicles for evacuation.
• The collapse was caused by ground pressure during tunnel boring machine operation.
• The project has been halted pending investigation and safety inspections.
• Rescued workers were visibly shaken but expressed relief upon reaching safety.
Summary
On July 9, 2025, a section of a tunnel under construction in Los Angeles collapsed, trapping 31 workers 120 meters underground. The incident occurred without warning, 8 kilometers from the tunnel’s sole entrance. The tunnel, part of a municipal sewage project, spans 11 kilometers in length and 5.5 meters in width. Emergency response teams, including over 100 personnel from the Los Angeles Fire Department, conducted a swift rescue operation, ensuring all workers were safely evacuated without major injuries. The collapse was attributed to ground pressure during the operation of a tunnel boring machine. Workers had to navigate the collapse site on foot before reaching vehicles for evacuation. The project has been suspended pending a thorough investigation and safety checks. Rescued workers expressed both relief and emotional distress following the ordeal.
