A 14-year-old Florida boy is dead after falling into a muddy trench at a construction site while helping his father.

The muddy mixture of sand and water acted like quicksand and only the top of the boy's head was visible when rescuers arrived Sunday, authorities said.

Danilo Riccardi Jr. was trying to get water from the trench to mix concrete when he fell into the 8-by-10-foot hole.

Authorities say it took almost three hours to dig out his body

The boy and two brothers were helping their father work on a church construction site in southwest Florida.

An autopsy has been scheduled and the Occupational Safety and Health Administration will investigate the death.