During production of Iron Man 3, we were asked to come up with a number of alternate suits for the "House Party Protocol" scene at the climax of the film. Having done a lot of different suits over the years, we had a number of abandoned designs to choose from already. This one came from a design done for the original Iron Man, when producer Avi Arad requested an underwater suit for an earlier version of the script. I had already sketched out a hard-shell pressure suit for ultra-deep dives, so with its distinctive silhouette it was a natural choice for the frenetic final battle. All it took was to dust it off, polish the details and create a back view for the new movie.