Build :1966 by Royal Dockyard, Chatham, UK, nr ??
A submarine is usually hidden underneath the surface of whatever water it is sailing through, which sometimes is a good thing.
This one, the Onondaga is being hauled out of the water after a (hopefully) fruitfull life and will serve out her time as a exhibition piece of a museum: to be precise: the Musée de la Mer de Pointe-au-Père, near Rimouski Que, Canada
And then people will finally see what she has been hiding for all those years:
She looks like a Rhinoceros!!!