S-6 was on patrol during the Autumn of 1941 when it apparently blundered into a German minefield off the island of Oland. The wreck is broken into multiple sections and was likely operating on the surface when it hit one or more mines.
|Wreck of the S-6 (RusNavy.com)|
The photo of the S-6 on the Daily Mail Online website appears to be incorrect (see link above). The sub in the news article appears to be the United States submarine S-6 (SS-111). I couldn't find a photo of the Soviet S-6 but there is an S-class submarine preserved in Vladivostok. Take a look for yourselves.
|Photo of S-6 on the Daily Mail Online website|
|Soviet S-class submarine S-56|