http://www.hs.fi/english/article/Sweden ... 5264270023$1:
The Swedes have discovered a sunken submarine at the bottom of the Baltic Sea, south of the island of Gotland.
According to the Swedish Armed Forces, the wreck was actually found in connection with a dive by marine researchers as long ago as in 2009, but the discovery was made public only now.
According to Swedish Radio, the Armed Forces first believed the wreckage to be one of the wartime U-boats sunk by the Soviet Union that the Swedish Navy had already mapped out previously.
Recently it was realised, however, that the wreck in question is previously unknown and dates from the time of the Cold War.
The Swedes famously hunted Soviet subs in their waters with little material success apart from the embarrassing case of S-363, a Whiskey-class Soviet submarine that ran aground close to the Swedish naval base of Karlskrona in October 1981, but now the Swedish Navy suspects that the vessel may be another such Soviet sub, possibly one that sank while being towed.
According to retired General Bengt Gustafsson, the former Commander of the Swedish Defence Forces, the Navy chased Soviet submarines in waters around Utö back in 1980, and the sunken vessel could be a Soviet submarine that was hit by depth charges back then.
The 'explanation' that this was a sub under tow is BS. The Soviets would never have towed a disabled sub through anyone else's territorial waters given the risk that it could be seized.
Most likely it had been sunk and the Soviets had disavowed knowledge of any subs in the area at the time it was sunk.
Were it an actual salvage operation that went wrong the sub would've been raised given that it's in shallow waters.