Director Christopher Nolan has refused to go CGI heavy in this next film, Dunkirk, and will use real battleships for some scenes in the film.
Nolan has never been one to overuse CGI, since releasing Batman Begins back in 2005. As a fan of practical effects, I think this brings more of an authenticity to his films.
French nautical magazine Presse Ocean, is reporting that Nolan is planning to use the French T-47 Class Destroyer, Maillé-Brézé for his WWII Dunkirk film, which will be towed to Saint-Nazaire and then transformed into a working vessel.