Frantic hunt for Indonesian submarine as rescuers hone in on signal

In this aerial photo taken from a maritime patrol aircraft of 800 Air Squadron of the 2nd Air Wing of Naval Aviation Center (PUSPENERBAL), the Indonesian Navy submarine KRI Alugoro sails during a search for KRI Nanggala, another submarine that went missing while participating in a training exercise on Wednesday, in the waters off Bali Island, Indonesia, Thursday, April 22, 2021. Indonesia's navy ships on Thursday were intensely searching for the submarine that likely fell too deep to retrieve, making survival chances for all the crew on board slim. Authorities said oxygen in the submarine would run out by early Saturday. - AP

BALI, April 23 (AFP): Indonesia's desperate search for a missing submarine and its crew of 53 honed in on a signal from an unidentified object Friday, with just hours to go before the stricken vessel's oxygen reserves ran out.

The ramped-up hunt comes as Australia and the United States are set to join the search off the coast of Bali where the sub disappeared more than two days ago during training exercises.

Late Thursday (April 22), the military said it picked up signs of an object with high magnetism at a depth of between 50 and 100 metres (165 and 330 feet).

Ships equipped with specialised tracking equipment were deployed in the hope that the object could be the KRI Nanggala 402, which was equipped with oxygen reserves that could last until early Saturday, authorities said.

"We've only got until 3:00 am tomorrow (Saturday) so we're maximising all of our efforts today," said Indonesian military spokesman Achmad Riad.

"Hopefully there will be a bright spot."

Berda Asmara was among those anxiously awaiting news.

Her sailor husband Guntur Ari Prasetyo, 39, had expected to return home from the submarine training mission at the weekend.

"Our last communication was on Monday when he was going to work," the mother of one told AFP in Surabaya, a port city in Java.

"He said 'pray for me that I'll come home soon'...He told our daughter to listen to me and study hard."

- 'Very limited oxygen' -

Despite hopes for a miracle, an oil spill spotted where the submarine was thought to have submerged pointed to possible fuel-tank damage, fanning fears of a deadly disaster.

There are also concerns that the submarine could have sunk to depths believed to be as much as 700 metres (2,300 feet) -- well below what it was built to withstand.

The German-built vessel was scheduled to conduct live torpedo exercises when it asked for permission to dive. It lost contact shortly after.

On Thursday, the US military said it would send airborne teams to help in the search, while Australia said two ships were on their way to assist.

Neighbouring Singapore and Malaysia have already dispatched ships that are expected to arrive at the weekend, including the city-state's MV Swift Rescue -- a submarine rescue vessel.

India said Thursday it had sent a ship to assist in the hunt.

But hopes of finding the crew alive were fading fast.

"If there is serious damage on the boat itself, it could potentially mean a few things, for example, there will be very limited spaces for the crew with very limited oxygen," said Collin Koh, a naval affairs specialist and research fellow at the S. Rajaratnam School of International Studies in Singapore.

"It could also mean that the reserve tanks for the oxygen might potentially be damaged as well. So it will further reduce the oxygen level."

Submarines are equipped to prevent carbon dioxide buildup, but if the equipment was damaged that could also pose a serious risk, Koh added.

"It's not just about whether there will be enough oxygen, but it's also about the level of carbon dioxide within the interior that could determine the fate of the submariners," he said.

- Deadly disasters -

While Indonesia has not previously suffered a major submarine disaster, other countries have been struck by accidents in the past.

Among the worst was the 2000 sinking of the Kursk, the pride of Russia's Northern Fleet.

That submarine was on manoeuvres in the Barents Sea when it sank with the loss of all 118 aboard. An inquiry found a torpedo had exploded, detonating all the others.

Most of its crew died instantly but some survived for several days -- with a few keeping heart-breaking diaries written in blood to their loved ones -- before suffocating.

In 2003, 70 Chinese naval officers and crew were killed, apparently suffocated, in an accident on a Ming-class submarine during exercises in 2003.

Five years later, 20 people were killed by poisonous gas when a fire extinguishing system was accidentally activated on a Russian submarine being tested in the Sea of Japan.

And in 2018, authorities found the wreckage of an Argentine submarine that had gone missing a year earlier with 44 sailors aboard. - AFP
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