Tranquility Lane simulation The Tranquility Lane simulation is the current active program of a Vault - Tec prototype simulation created by Stanislaus Braun , located within the Tranquility lounger s at Vault 112 . Background . Vault 112 was one of the last vault s to be constructed . The construction started in November 2068 , and finished in June 2074 . It was designed to accommodate only 85 occupants , who would be suspended in a virtual reality world for the indefinite duration of the vault ' s experiment . The simulator was designed by Dr . Stanislaus Braun , inventor of the Garden of Eden Creation Kit , and initially contained several simulated utopias . The system should have permitted a select few to live a " perfect life " virtually , if not practically , forever . What Vault 112 ' s occupants didn ' t know was that once they entered the virtual reality pods , Braun would exercise complete control over the simulation ; they had no means of leaving on their own . They became his playthings , completely at his mercy . Dr . Braun , after becoming bored of various simulated worlds , would proceed to virtually " kill " each one of them . When he finished " killing " the vault ' s population , he would wipe their memory , resurrect them within the next simulation , and proceed to murder them yet again . Braun went through several simulations prior to initiating Tranquility Lane . The simulation reminded him of his hometown of Kronach , but was distinctly American . Braun ' s subjects were naturally at home and felt safe in this environment , which made it more satisfying for him when he tormented them and shattered the peace of suburban life . By the time the Lone Wanderer came upon Vault 112 , the simulation had been going for at least several decades . Residents . The following are the residents that " live " in Tranquility Lane : Buildings . Abandoned house . The abandoned house contains a hidden terminal which allows the player to complete the Tranquility Lane quest without satisfying Betty ' s morbid sense of entertainment . Dithers residence . The Dithers residence is the home of Old Lady Dithers . Henderson residence . The Henderson residence is the home of Mabel Henderson . A Mister Handy cooks , cleans and irons here for Mabel . Neusbaum residence . The Neusbaum residence is the home of George , Pat and Timmy Neusbaum . It contains the military school brochure . Rockwell residence . The Rockwell residence is the house of Roger and Janet Rockwell . Simpson residence . The Simpson residence is the home of Martha Simpson . It contains the lacy underwear that may be used to break up the Rockwells . Appearances . The Tranquility Lane simulation appears only in " Fallout 3 " . It also appears on the screen inside of the flight simulation pods in Nellis Air Force Base in " " . Bugs . Before entering the vault it is recommended to instruct your followers to wait inside Smith Casey ' s Garage and save the game , because it ' s possible that one ( or more ? ) of the followers ( e . g . Charon ) may disappear after leaving Vault 112 or the Tranquility Lane simulation . If the companions enter the Vault with the Lone Wanderer , they may automatically be fired . It may take a " long " time for them to reappear .