REDDING, Calif. -

The Shasta County Sheriff’s Office announced Thursday that the body of 18-year-old Robinson Sok, from Oakland, had been recovered from Shasta Lake on the McCloud arm near Turntable bay.

The victim’s family contacted a third party with deep water sonar capabilities who assisted in the recovery.

Sok was trying to help a friend who was struggling in the water Sept. 9, 2013, when for unknown reasons he disappeared under the water.

The friend survived but Sok never came up.

Authorities were initially unable to recover Sok’s body due to the depth of the lake in the area he drowned. The San Francisco Police Department was called in to assist bringing high definition sonar equipment and cameras to search the murky lake waters.

During the search a SFPD remote operated vehicle became entangle under the water prompting officials to call in a local deep water diving expert, Ken Smith of Redding.

In the attempted retrieval of the disabled vehicle a Shasta County Sheriff’s deputy was injured trying to rescue the volunteer diver, Smith, who was not responding to communications.

Deputy John Zufall found Smith unconscious at 170 feet below the water and pulled him to the surface but Smith did not survive.

The investigation into teen's drowning continues by the Boating Safety Unit and the Coroners’ Office.