A young person was found dead after he swam in a lake in California last week, authorities said Thursday.

The Madera County Sheriff's Office said a 19-year-old from Los Angeles County was accounted for missing Aug. 

10 and had been unaccounted for eight hours after he swam alone to one of the islands in Thousand Island Lake. 

He was most recently seen shorewards from a distance by the party he went climbing with, specialists said.

Search and salvage groups were called, found the high schooler and mentioned a maritime air station helicopter to give clinical help. 

At the point when the helicopter showed up, the adolescent was viewed as dead and was taken to Fresno Yosemite International Airport with his dad, 

who went climbing with him, as per specialists. Fresno Airport Police and staff from the district sheriff's office met with them there.

The Thousand Island Lake is important for the Ansel Adams Wilderness in eastern Madera County, which has a height of 9,833 feet, 

with 10,000-foot tops encompassing it. Specialists advised their high-country snow capped lakes are "very cool" regardless of whether the valley floor sees 100-degree days.

"At Thousand Island Lake, the short-term lows are in the low 40's around evening time, 

and the actual lake is taken care of by ice sheets from Mount Ritter and Mount Banner, the pinnacles of which are -/+ 12,000 feet in height. 

Indeed, even in the hotter months, the water is very cool," the sheriff's office said.

Madera County Sheriff Tyson Pogue stretched out his consolidates to the casualty's loved ones in an explanation.

"Occurrences like this are really tragic, and the absolute hardest calls we lead as specialists on call," Pogue said.