Excellent Video of Mystery Creature or Submarine in the Thames

The photo below is from a video taken a couple of days ago from the cable car in Greenwich in London, and linked here. It does not appear to be a CGI effect, but we cannot be certain about that in this case. It seems unlikely, but it could have been done. If it is real, then it is a sea creature between 40 and 60 feet long with a double dorsal fin. The only such creature ever reported was Giglioli's Whale, which was observed in 1867 about 1200 miles off the coast of Chile. However, there have never been any repeat observations, and Giglioli's Whale is not recognized by science.

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