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The Swedish naval vessel HMS Visby in the Stockholm archipelago.
The Swedish naval ship HMS Visby in the Stockholm archipelago. Sweden believes a submarine wreck found off the country’s coast may have been a Russian vessel that sank in 1916. Photograph: Fredrik Sandberg/AFP/Getty Images
The Swedish naval ship HMS Visby in the Stockholm archipelago. Sweden believes a submarine wreck found off the country’s coast may have been a Russian vessel that sank in 1916. Photograph: Fredrik Sandberg/AFP/Getty Images

Sweden says submarine wreck probably Tsarist-era Russian vessel

This article is more than 8 years old

Submarine likely to be Som-class submarine, nicknamed Catfish, which sank after collision with Swedish vessel in 1916

The wreck of a submarine found off Sweden’s coast was probably a Tsarist-era Russian vessel that collided with a ship about a century ago, the country’s military has announced.

“We are most likely talking about the Russian Som-class submarine – nicknamed Catfish – which sank after a collision with a Swedish vessel in 1916 during the first world war and before the Russian Revolution,” the Swedish armed forces said.

Video of the wreck from the Ocean X team Guardian

Speculation had been swirling about the origins of the vessel after Swedish divers announced on Monday that a submarine had been found about 1.5 nautical miles off the coast of central Sweden.

The announcement came nine months after a high-profile hunt for a mystery submarine in Swedish waters, which some suspected was a modern Russian vessel.

The Swedish military said pictures of the wreck taken by the divers confirmed its own analysis and that it did not think a full technical analysis was necessary. Experts identified it as an imperial Russian navy sub that sank with an 18-member crew in May 1916 after a collision with a Swedish vessel.

Swedish newspaper Dagens Nyheter said it was a submarine built for the imperial Russian navy in Vladivostok in 1904 and integrated into the naval fleet in the Baltic Sea in 1915.

“Judging by the pictures, it is the Som,” Konstanin Bogdanov, head of a state-backed team of wreck divers in Russia, told AFP, referring to what appears to be Cyrillic lettering on the submarine’s outer shell.

He said his team would be happy to study the find together with the Swedish divers. “We are ready to conduct a joint expedition,” he said, adding that if the wreck is confirmed as the Catfish it would be important to also “immortalise the memory” of those who perished.

Stefan Hogeborn, a diver with the Ocean X Team that made the discovery, said the mini-sub was completely intact with no visible damage to the hull and the hatches were closed. “It is unclear how old the submarine is and how long it has been laying at the sea floor, but the Cyrillic letters on the hull indicate that it is Russian,” he said in a statement on Monday.

In October, Sweden’s navy launched a massive hunt for a foreign submarine, suspected to be Russian, in the Stockholm archipelago. The military subsequently confirmed that “a mini-submarine” had violated its territorial waters, but was never able to establish the vessel’s nationality.

Last year’s hunt for the mystery vessel came at a time of particularly high tensions between Russia and the West over the conflict in Ukraine.

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