The youngsters, aged between 17 and 18, residents of Tadbund area here, had entered the Umdasagar lake at around mid-noon, and drowned, Mailardevpalli Police Station Inspector S Venkat Reddy told PTI.
"A group of nine youths went to the lake and five of them had entered the water, though none of them knew swimming. Four of them drowned while another youth has been rescued," Reddy said, adding their bodies have been retrieved.
The youngsters were working as labourers.