 Sommers felt "almost 100 percent" of the technology in the film would be available within 10 to 20 years, citing the various books and magazines about developing weapons that he loved reading. For example, Sommers said he believed invisibility was impossible, but the virtual invisibility provided by camouflage camera that projects what is behind a soldier on their front allowed him to include it. The production designers modelled the interior of Destro's private submarine on a Handley Page Jetstream. Sommers said the bulky immobile "accelerator suits" (which Beattie said had enabled them to write "a car chase where one guy's not even in a car") had been tough on the actors and were likely to have their roles reduced in potential sequels. Critics have compared the suits to that of NFL SuperPro, a comic book character jointly licensed by the NFL and Marvel Comics, and resembling an armored football player.
