The Occupational Safety and Health Administration is investigating an incident in which a worker suffered serious injuries after a trench collapsed at a construction site in Omaha.
The incident occurred on Wednesday afternoon.
Workers were digging under a new house being built when a side wall collapsed. One of the workers was trapped from the waist down.
Emergency services arrived shortly after the incident and freed the man. He suffered a pelvic fracture and was taken to hospital in a stable condition.
According to OSHA, cave-ins pose the greatest risk and are much more likely than other excavation related accidents to result in worker fatalities. Trenches 5 feet (1.5 meters) deep or greater require a protective system unless the excavation is made entirely in stable rock. Trenches 20 feet (6.1 meters) deep or greater require that the protective system be de-signed by a registered professional engineer or be based on tabulated data prepared and/ or approved by a registered professional engineer.