Five Cut Features on the Irrational Website looks at five features that were axed from System Shock 2 and BioShock before these games were released. Perhaps the most interesting of these was the plan to include atmospheric pressure in BioShock, which would impact enemy AI and other gameplay factors. Word is: "In fact, the feature was functioning when the game shipped," but they explain that the feature caused gameplay and production issues, but that: "the issue that put the nail in the system’s coffin – was that we never found a good way to clearly convey the effect of pressure through audiovisual changes."