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Missing Indonesian submarine with 53 people on board may have sunk too deep to reach

The KRI Nanggala 402 was participating in a training exercise when it missed a scheduled reporting call.

Image: PA Images

INDONESIAN NAVY SHIPS are searching for a submarine that is likely to have sunk too deep to retrieve, making survival chances for the 53 people on board slim.

The diesel-powered KRI Nanggala 402 was participating in a training exercise on Wednesday when it missed a scheduled reporting call.

Officials reported an oil slick and the smell of diesel near the starting position of its last dive, about 60 miles north of the resort island of Bali, although there has been no clear evidence they are linked to the submarine.

The navy said it believes the submarine sank to a depth of 2,000-2,300ft — much deeper than its collapse depth, estimated at 656ft by a firm that refitted the vessel in 2009-12.

Ahn Guk-hyeon, an official at South Korea’s Daewoo Shipbuilding and Marine Engineering, said most submarines collapse if they go deeper than 656ft because of pressure on the hull.

He said his company upgraded much of the sub’s internal structures and systems, but lacks information about the vessel because it has not been involved with any work on the ship in the past nine years.

Frank Owen, secretary of the Submarine Institute of Australia, also said the submarine could be too deep for a rescue team to operate.

“Most rescue systems are really only rated to about 600 metres (1,969ft),” he said.

“They can go deeper than that because they will have a safety margin built into the design, but the pumps and other systems that are associated with that may not have the capacity to operate. So they can survive at that depth, but not necessarily operate.”

Indonesia’s military said five navy ships and a helicopter were taking part in the search while a hydro-oceanographic survey ship with underwater detection gear is on its way to the site around the oil spills.

Neighbouring countries also sent rescue ships to support the complex operation. Vessels from Singapore and Malaysia are expected to arrive on Saturday. The military said Australia, the US, Germany, France, Russia, India and Turkey have also offered assistance.

Indonesia’s navy said an electrical failure may have occurred during the dive, causing the submarine to lose control and become unable to undertake emergency procedures that would have allowed it to resurface.

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It was rehearsing for a missile-firing exercise that was to take place today, which military chief Hadi Tjahjanto and other military leaders were to attend.

2.59316637 The KRI Nanggala (file photo) Source: AP/PA Images

The German-built submarine, which has been in service in Indonesia since 1981, was carrying 49 crew members, its commander and three gunners, the Defence Ministry said. It had maintenance and overhaul in Germany, Indonesia and most recently in South Korea, from 2007 to 2012.

Indonesia has a fleet of five submarines and plans to operate at least eight by 2024.

The world’s largest archipelago nation with more than 17,000 islands has faced growing challenges to its maritime claims in recent years, including numerous incidents involving Chinese vessels near the Natuna islands.

Last year, President Joko Widodo reaffirmed the country’s sovereignty during a visit to the islands at the edge of the South China Sea, one of the busiest sea lanes where China is embroiled in territorial disputes with its smaller neighbours.

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