There’s a whole glorious mine of nerdy information on submarine cables available. I am a mild nerd in this area, due to my interest in my home county of Cornwall, where many submarine cables come ashore. Steven Heaton’s site is a wonderful source of information on this subject. He recently linked to the Kingfisher bulletins which fortnightly report hazards to fishing, including exposed subsea cables. There’s a whole archive going back three years! I don’t think I’ll look through all of that archive….
Another superb resource on this subject is the Flickr photostream of Global Marine Photos which has many images of marine cable laying, including the one above of the cable layer ship CS Sovereign.
Photo by Global Marine Photos