I have to admit I have seen this sighting used as proof of dinosaur survival, but something troubled me about the description: just how do you get to see the feet of a sea creature if it’s swimming by, unless it was resting on its back, feet in the air. Still, that was only a minor quibble and I thought it was worth looking into the tale a little more. Perhaps I would be able to identify where the sighting had taken place. I figured out that these days it's no doubt possible to track down records of the voyages of U109 so I reckoned it wouldn’t take long to have a rough location.
Well, imagine my surprise when I discovered the location of U109 that July evening; it was sunk with all hands at the bottom of the English Channel having run foul of a minefield. There is some confusion of the date of the vessel’s actual sinking, either on 26 January 1918 or 4 July 1918; whichever date it was it would make spotting that North Sea creature a little hard to believe. Perhaps it’s the wrong boat, the wrong year or maybe it's been just made up. I will let you decide; personally I know which answer I would choose.