An Indian Air Force (IAF) aircraft which disappeared on Friday with 29 people on board remained missing on Sunday despite an intensive search and rescue operation, codenamed 'Operation Talash", and some pointers were provided by indigenous satellites.
A senior defence ministry official said indigenous satellites have provided some pointers and ships are searching the indicated area, but nothing has been spotted.
The navy has pressed a flotilla of vessels including a submarine to locate the missing AN-32 which went off the radar two days ago over the Bay of Bengal just half hour after taking off from Chennai on its journey to Port Blairr.
There has been no trace of the plane or debris. There are also no signals from the transporter, officials said.
According to Indian Coast Guard, an international safety network was activated as part of the search and rescue procedures for alerting the merchant ships passing through the region.
The Coast Guard said ships like MV Harsh Vardhana enroute from Port Blair to Chennai, MV Sebat and MV Delice were directed to keep a sharp look out for survivors or debris.
An experienced pilot of the Indian defence forces told IANS: "Normally it would take a week for the debris to float in such cases. But search and rescue operations have to be carried out."
According to him, if the plane broke into several parts, then there may be a possibility of some debris floating.
But if it falls into the sea without breaking, then it may take nearly a week for some items to come to the surface from the sea depth.
"As per our calculations the sea depth in the area of search is around 3,500 metres," T.M. Balakrishnan Nair, Head, Information Services Group, Indian National Centre for Ocean Information Services (INCOIS), told IANS over phone from Hyderabad.
He said the organisation was running models estimating the distance to where the plane debris would have been carried by the sea current.
"In the Bay of Bengal there are several whirlpools that may have dragged down the debris," he added.
Eastern Naval Command chief Vice Admiral H.C.S. Bisht said that a large number of ships, helicopters and aircraft are contributing to the search.
"We are also seeking ISRO's help to get satellite imagery of that area so that we have at least some information... Parallelly we are also reaching out to families," he said.
Defence Minister Manohar Parrikar, after reviewing the search and rescue operations on Saturday, had asked the commanding officers to keep in touch with families of those on board the missing aircraft.
Bisht said the search has been made difficult by the monsoon weather conditions over the sea.
"The only challenge we are facing is of monsoon condition, rough seas; another challenge is the depth which is around 3,500 meters and at some points even more than that," he said.
The cloud base is low and it is raining continuously in the area, he said.
"We are continuously searching the area. As of now we have 12 ships. We will be increasing the assets. We are also doing regular aerial surveillance. The aim is to harness as many resources as possible."
The missing aircraft, an upgraded AN-32 belonging to 33 Squadron, took off from Tambaram Air Force Station in Chennai at 8.30 a.m. and was expected to land at Port Blair in the Andaman and Nicobar Islands at 11.30 a.m.
The recorded transcript of Chennai air traffic radar showed the last pickup of the aircraft was 151 nautical miles east of Chennai when it was observed to have carried out a left turn with rapid loss of height from 23,000 feet.
The AN-32 is a twin engine turboprop, medium tactical transport aircraft of Russian origin. It can carry a maximum load of around 6.7 tonnes or 39 paratroopers. Its maximum cruise speed is 530 kmph.
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