We are done with the first week of photography. I am happy to report that the ten months of preparation allowed the extremely challenging first week of photography to come off without a hitch. The look is fantastic and the performances are great as well. Downey was definitely the right choice.
I’m looking forward to getting out of the “cave.” The first few weeks of shooting are spent, somewhat in sequence, establishing Stark’s captivity. It sets the table tonally for the rest of the film. The close quarters and tight schedule make it the toughest part of the shoot on the cast and crew.
Source. (Thanks, Stephen!)