A man working near a construction site in La Presa Friday morning was pinned beneath a concrete panel and had to be rescued with a crane.
Medics responded to the scene in the 9900-block of Jamacha Boulevard at about 8:30 a.m., according to CalFire.
CalFire Battalion Chief Larry Converse told NBC 7 that a construction worker was working in a large hole when the accident happened.
Converse said that a 1,400-pound shoring form -- a large panel that holds material back -- suddenly became loose and fell in the hole.
The panel did not land directly on the man, but trapped him inside the hole where he was originally working.
Rescue workers stabilized the man's head and neck and then pulled from beneath the hole with a crane. The rescue took about 20 minutes, according to the man's co-workers on the scene.
Workers said the accident was scary, and they were relieved to see their co-worker was responsive after the panel fell.
The man is expected to be okay, although he has back pain. He will be transported to the hospital.
California's Occupational Safety and Health Administration is investigating the accident. CalFire said there was no obvious safety violation, since the construction worker was fully strapped in and never untied himself.
Pacific Hydrotech Corporation, the company which the man was working for, is also investigating the incident.