Authorities say a Sioux Falls man is dead after an embankment caved in on him while he was working at a construction site in southeastern South Dakota.

Union County Sheriff Dan Limoges says the 27-year-old was unloading wall forms into the ground for a basement with other workers at about 10 a.m. Tuesday at the Dakota Dunes site. That was when portions of the embankment gave way.

The man was buried in sand and dirt and it took about four minutes to get him out.  Limoges says he was unresponsive. Efforts were made to try to resuscitate him and he was rushed by ambulance to a local hospital,
but was later pronounced dead.

Authorities haven't released the man's name and were working to notify family first.