How Australia's first submarine sank near the start of World War I in 1914 off Papua New Guinea

Researchers have solved the 104-year mystery about what sank Australia's first submarine, sending 35 sailors to a watery grave off Papua New Guinea

Researchers have solved the mystery of 104 years ago about what sank Australia's first submarine, sending 35 sailors to a watery grave off Papua New Guinea.

The HMAS AEI sank on this day in 1914, with diving experts convinced that a vent valve partially open in the hull caused the tragedy.

The submarine was the first loss in times of war for the Royal Australian Navy and the first loss of Allied submarines in the First World War.

Researchers have solved the 104-year mystery about what sank Australia's first submarine, sending 35 sailors to a watery grave off Papua New Guinea

Researchers have solved the 104-year mystery about what sank Australia's first submarine, sending 35 sailors to a watery grave off Papua New Guinea

Experts who analyzed the wreck of World War I believe that HMAS AEI sank after a vent valve in the hull was left partially open when the submarine submerged.

Experts who analyzed the wreck of World War I believe that HMAS AEI sank after a vent valve in the hull was left partially open when the submarine submerged.

Experts who analyzed the wreck of World War I believe that HMAS AEI sank after a vent valve in the hull was left partially open when the submarine submerged.

The submarine was last seen patrolling in front of East New Britain on September 14, 1914, during an otherwise successful operation to seize the German colonies in New Guinea and the South Pacific.

But the 35 submariners on board died when an implosion crashed through the ship as it sank to its depth of 100 meters, according to a report by the Australian National Maritime Museum.

It was not clear if it was human error or mechanical failure that caused the failure.

But an open valve, however, may have caused water to flood the engine room.

A search by five ships of the Navy in the following days failed to find the submarine, nor any tell-tale of the oil that escapes floating on the surface of the water.

The 35 sailors on board died when an implosion crashed through the ship as it sank to its depth of 100 meters, according to a report by the Australian National Maritime Museum.

The 35 sailors on board died when an implosion crashed through the ship as it sank to its depth of 100 meters, according to a report by the Australian National Maritime Museum.

The 35 sailors on board died when an implosion crashed through the ship as it sank to its depth of 100 meters, according to a report by the Australian National Maritime Museum.

And there was not a distress call to help guide the search.

The action of the enemy was not suspected because the only German ship nearby at that time was a small reconnaissance ship.

In December 2017, the wreck was discovered in 300 meters of water during a search on the islands of the Duke of York, near the capital of New England, Rabaul.

It was the fourteenth attempt to find the ship and the resting place of its crew.

In April 2018, an expedition to the wreck site was carried out.

In December 2017, the wreck was discovered in 300 meters of water during a search on the islands of the Duke of York, near the capital of New England, Rabaul.

In December 2017, the wreck was discovered in 300 meters of water during a search on the islands of the Duke of York, near the capital of New England, Rabaul.

In December 2017, the wreck was discovered in 300 meters of water during a search on the islands of the Duke of York, near the capital of New England, Rabaul.

In April 2018 an expedition was made to the wreck site, giving some answers to what happened 104 years ago.

In April 2018 an expedition was made to the wreck site, giving some answers to what happened 104 years ago.

In April 2018 an expedition was made to the wreck site, giving some answers to what happened 104 years ago.

The final contact of AE1 with the destroyer HMAS Parramatta at 2.30pm, more than a century ago, had placed it in the area.

The inhabitants of the island Mioko at that time also talked about seeing a "monster". or & # 39; devil's fish & # 39; that appeared and disappeared quickly in the depths.

AE1 was one of the two class E submarines built in Britain for the new Australian navy.

It was launched in May 1913 and put into service in February 1914.

The other E-class submarine, AE2, achieved fame when she penetrated the Dardanelles waterway at the same time that the Australian troops landed at Gallipoli.

After attacking the Turkish ships in the Sea of ​​Marmara, AE2 was attacked by a Turkish gunboat and sank so that it would not fall into Turkish hands.

All his crew was captured and became prisoners of war.

That shipwreck was discovered in 1998.

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