Due to recent downpour, the oldest colossal tank had waters to its full capacity now for the first time and started developing minor breaches, officials said.
The victims, all relatives, belonged to Anantapuramu district and were on their way to Tirupati from Dharmavaram to attend a wedding engagement ceremony scheduled for Sunday morning.
It is suspected that some deaths have occurred in the accident as well, an official said but could not immediately confirm the information.
A 25-year-old sailor died on vessel 'INS Kalinga' with Navy today claiming that the death was caused by a bullet injury sustained while handling firearms even as police suspected it to be a case of suicide.
The ruling Yuvajana Sramika Rythu Congress described it as the 'social cabinet', with 70 per cent representation to the BC, SC, ST and minority communities.