The search operations would move into the third phase next week and the National Institute of Ocean Technology (NIOT) had been requested to bring its remotely operated vehicle that can be taken to a depth of 3,500 metres, Coast Guard Commander (East) Inspector General Rajan Bargotra said here.
So far two phases -- surface search and sub-surface -- have been undertaken, but no debris of the transport aircraft that went missing on its way to Port Blair from Tambaram airbase here has been found, he told reporters here on the sidelines of Regional Editors Conference, organised by the Press Information Bureau.
Bargotra said at present two vessels -- "Samudra Ratnakar" from the Geological Survey of India and "Sagar Nidhi" of NIOT, were deployed in the sub-surface search.
Noting that the search operations began with 13 ships of Coast Guard and Navy, besides IAF aircraft, he said when it was certain that there was no debris visible on the surface, the search was "tapered" down to sub-surface search.