Perhaps submarines are always in the East River, just, you know, submerged--but we've never seen one. Until now! This one just floated through DUMBO headed in the direction of Williamsburg. So if you're a hipster wearing your "Defend Brooklyn" T-shirt, the day has come to back it up!
UPDATE: We have been told that this was indeed the Growler submarine, "one of the exhibits from the Intrepid Sea, Air and Space Museum - being tugged up the East River today, on its way to GMD Shipyard Corp. facilities at the Brooklyn Navy Yard. The Growler is in dry dock for a hull scrape, some minor exterior repairs and a full, historically accurate paint job that will see the sides painted grey and the top (the part that's visible above water) painted black."
She will then be towed back by four tug boats to Pier 86 in time for the November 8 reopening of the Intrepid Sea, Air and Space Museum. And the Intrepid returns to Manhattan after a nearly two-year refurbishment project on October 2nd!