I don't need to tell you about the book Shadow Divers and it's status of being in development as a feature film slated for direction by Ridley Scott. Since all-knowing IMDb doesn't have production details it's anyone's guess when something will be produced but in the interim you can watch the 2004 documentary from NOVA, Hitler's Lost Sub. It brought the book to life, so to speak, by following Kohler and Chatterton's discovery of U-869.
When (if?) Shadow Divers The Movie is produced you can be sure that experts will surface in the media to correct whatever historical inaccuracies might exist in the film. Will we hear from wreck-diver, researcher, and author Gary Gentile? His book Shadow Divers Exposed: the Real Saga of the U-869 has mixed reviews at Amazon but appeals to history buffs (and engineers) who appreciate accuracy.
(Thanks Marshall!)