ENCINO, Calif. (AP) — Authorities say a worker repairing an underground sewer line at an Encino home died after the trench he was working in partially collapsed.

The Los Angeles Fire Department said firefighters who responded to the scene Wednesday found the worker buried chest high inside the construction trench.

It says firefighters had tried for about an hour to rescue the man from the 10-feet deep trench when he died.

Rescuers had to shore up both sides of the trench with plywood and lumber before they could recover the man’s body. The man’s identity and the name of his employer have not been released.

The California Division of Occupational Safety and Health is investigating the work site.