A High Altitude Long Endurance Remotely Piloted Aircraft (HALE RPA ) leased by the Indian Navy operating from INS Rajali, Arakonnam (near Chennai) encountered a technical failure at about 1400 hrs on Wednesday whilst on a routine surveillance mission which could not be reset in flight. The aircraft was navigated to a safe area over sea and carried out a controlled ditching at sea off Chennai. A detailed report has been sought from the original equipment manufacturer (OEM), navy said.