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Over seven years after an IAF AN-32 aircraft went missing in 2016, scientists at the Chennai-based National Institute of Ocean Technology (NIOT) stumbled upon its debris when they were testing the instruments of their newly-acquired autonomous underwater vehicle (AUV) for seabed mapping in December. It was during such a testing expedition undertaken by Research Vessel Sagar Nidhi on December 9-10 last year, about 310 km off the Chennai coast, the instruments on the AUV picked up some strong SONAR reflections from the seabed at a depth of 3,400 m. The strong signals intrigued the scientists who then decided to dive deeper for a closer look. "Then we dived a little deeper and took some photographs, which were shared with the Indian Air Force through the Ministry of Earth Sciences," G A Ramadass, Director, NIOT told PTI. Ramadass said the IAF confirmed that the debris was of the AN32 aircraft that had gone missing more than seven years ago. Another scientist said initially the debris