What The Heck Was Tugboat Pulling Up East River Past Roosevelt Island Today - Front Of Submarine, A Warhead Asks Bewildered Roosevelt Island Resident

From the Roosevelt Island Twitterverse:

WTF @ The Octagon (Roosevelt Island) https://t.co/caV996VRXl

— ScottyP (@scottpiro) July 24, 2015

WTF - this tugboat going up the East River is pulling...a nuclear warhead?...the front of a submarine?

A video posted by ScottyP (@scottpiro) on Jul 24, 2015 at 6:41am PDT

In August 2013 and February 2012 reported on a similar sighting.

@Rooseveltisland there was also what looked a lot like part of a submarine, on a barge. Anybody else saw it? pic.twitter.com/mU8RkKAxPF

— Nicolas Robine (@notSoJunkDNA) August 26, 2013

@ibookery @Rooseveltisland yes, heading North. Here is another picture, with Presbyterian hospital in the background pic.twitter.com/DaUvPefTuK

— Nicolas Robine (@notSoJunkDNA) August 26, 2013

A reader speculated the 2012 sighting was:

I think it's the tail section of a Virginia-class submarine.  Look at the diagonal fin on the bottom, then look at the back of the sub in this picture:
http://www.globalsecurity.org/...

(At first I thought it was the tail of a Seawolf, but they're not building any more of those, apparently - the Virginia's are smaller and cheaper)