Chatham is submarine central these days, you've got the WWI uboats (visible on Google Earth if you know where to look), then there's the Foxtrot SSK further up the river which is getting perilously close to sinking, and then, in somewhat better condition, there's HMS Ocelot.
There's some more pictures of the Medway Uboats here:
http://www.kenthistoryforum.co.uk/in...p?topic=2336.0
http://www.southeast-defencephotos.c...lbum=106&pos=1