Western Flanders Governor Carl Decaluwe told The Associated Press that the find on the floor of the North Sea "is very unique."
"It's quite amazing that we found something like this," Decaluwe said. "The impact damage was at the front, but the submarine remains closed and there are 23 people still onboard."
The UB II-type dive boat that was found is 27 metres long and 6 metres wide, and is lying at about a 45 degree angle, between 25-30 metres below the surface.
Video images show the submarine encrusted with barnacles and seaweed. It is also adorned with fishing gear, including nets.
Decaluwe said the U-boat was found by researchers. He declined to provide details about its location until the site has been protected. He has contacted the German ambassador because "we need to see what can do" with the remains.
Around 18 U-boats were stationed with the Flanders Flotilla in Bruges between 1915 and 1918. Thirteen of them were destroyed.
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