I visited this tentative WHS in July 2016. I visited by car from La Rochelle and stopped for a couple of hours before heading towards Royan. The main sight is the Arsenal Archway together with the maritime buildings as well as and the nearby Maritime Museum however most tourists visit Rochefort to see Hermione in the docks, a beautifully reconstructed replica of the 1779 Concorde class 12-pounder frigate. I enjoyed my visit although I think there are already too many inscribed maritime/naval WHS and this site wouldn't add anything new.