When SMS U-31 of the Kaiserliche Marine‘s IV Flotilla sailed from Wilhelmshaven on 13 January 1915, and disappeared shortly thereafter, it was assumed, she had struck a mine and sunk with all hands, somewhere in the North Sea.
Well, it turned out they were right.
Now, 101 years after her disappearance, her final resting place is known. In 2012 an engineering team plotting the site of a new offshore wind farm about 55 nautical miles off the coast of East Anglia found a wreck on the ocean floor.

Digital scan of the sunken U boat, which has been found off the East Anglian coast. The wreckage of a First World War German submarine has been found by divers 90km off the East Anglian coast. Video footage shows the sunken U-boat, which went missing 1915, on the sea bed under about 100 feet of water. The 58 metre long wreck was found by a survey team from energy companies Scottish Power Renewables and Vattenfall, who are currently drawing up plans for the new East Anglia ONE wind farm.
Initial investigation thought it to be a lost Dutch sub from the WWII-era, so the Dutch Lamlash wreck-diving team was called in last year and they have identified the vessel as U-31.
She was on her first patrol and, under the command of 28-year-old Oblt.z.S. Siegfried Wachendorff, she carried 33 souls.
