A German U-boat's sea mine was responsible for the sinking of the USS San Diego which perished in World War One.
The vessel was long suspected to have been destroyed by the German submarine and new evidence has now backed up this theory.
Six people lost their lives when the ship went under, but the rest of the 1,117 strong crew survived the ordeal.
The 500-foot long armoured vessel was destroyed in just 28 minutes and remains in tact under 110 feet of water off the coast of Fife Island, New York.
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3D images (pictured) collected by an autonomous underwater vehicle allowed researchers to find the spot of the blast and discover the cause of the ship's destruction. Six people lost their lives when the ship went under but the rest of the 1,117 strong crew survived the ordeal
Dr Alexis Catsambis, a maritime archaeologist from the Archaeological Institute of America, presented his findings at a research summit in Washington.
German submarine U-156 has long been suspected as the responsible party but the method of its destruction has remained a mystery for more than a century.
3D images collected by an autonomous underwater vehicle allowed researchers to find the spot of the blast to discover its cause.
Analysis revealed the gaping hole was too big to have been caused by an internal explosion - such as deliberate sabotage or a coal-powdered blast.
It is also claimed the aperture of the blast is not big enough for it to have been a torpedo strike and the tell tale bubbles that follow the projectile were not seen by 17 recorded eye-witnesses.
The researchers concluded the most likely explanation was either a T1 or a T2 torpedo tube mine.
Simulations re-created how the mine impacted life on the ship and found that it took only two minutes for the region of impact to become flooded.
Ten minutes post explosion saw the ship on its side and water flooding the gun deck.
The USS San Diego (pictured) was being used as an escort for military and supply ships and was intended to protect them on the first part of their journey to Europe. It was hit by a mine from German U-boat U-156 and sunk in only 28 minutes off the coast of New York
The ship was being used as an escort for military and supply ships and was intended to protect them on the first part of their journey to Europe.
'The format of the 3D modeling data makes analysis readily comparable,' said Ken Nahshon, PhD, of the Naval Surface Warfare Center Carderock Division in a statement.
'Before we started this, I wasn't familiar with the ability to do this underwater; above the water we do it all the time, but below water collecting 3D data is a challenge.
'I've learned that the sheer amount of expertise that's needed to interpret it is a credit to the advances of technology in sea floor mapping.'
It is believed the armoured shell of the ship is acting like a 'girdle' and keeping the rotting carcass of the ship contained.
WHAT WAS THE USS SAN DIEGO?
The USS San Diego was a 500-foot long armoured vessel which was built in 1904.
It was originally called the USS California (ACR-6) and renamed the San Diego in 1914 for World War One.
It sunk on July 18, 1918 when it was attacked off the coast of New York by a German U-boat.
A mine struck the hull of the vessel and it was completely submerged only 28 minutes later.
It is now mostly intact but upside down under 110 feet of water.
Six people lost their lives when the ship went under but the rest of the 1,117 strong crew survived the ordeal.
The USS San Diego was a 500-foot long armoured vessel which was built in 1904. It was originally called the USS California (pictured)
'The legacy of the incident is that six men lost their lives on July 18, 1918,' said Catsambis in a statement obtained by Fox News.
'With this project we had an opportunity to set the story straight and by doing so, honour their memory and also validate the fact that the men on-board did everything right in the lead up to the attack as well as in the response.
'The fact that we lost six men out of upwards of 1,100 is a testament to how well they responded to the attack.'
U-156 is thought to be the responsible party as records place it in the vicinity of the USS San Diego at the time.
On July 22 1918, a few days after the demise of USS San Diego, it executed the sole attack on the US mainland of the war when it attacked some Massachusetts based tugboats.
The submarine hit a U minefield in the North Atlantic and sank before the war ended and has never been located.
Link hienalouca.comhttps://hienalouca.com/2018/12/13/american-armoured-warship-was-destroyed-by-a-german-u-boats-sea-mine/
Main photo article A German U-boat’s sea mine was responsible for the sinking of the USS San Diego which perished in World War One.
The vessel was long suspected to have been destroyed by the German submarine and new evidence has now backed up this theory.
Six people lost their lives when the ship went u...
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