Tranquility Lane Tranquility Lane theme Tranquility Lane is a main quest in " Fallout 3 " , an Xbox 360 / PC achievement and a PlayStation 3 trophy . The quest begins immediately after the completion of Scientific Pursuits as the Lone Wanderer sits in a Tranquility Lounger in Vault 112 . The quest can also be accessed immediately after the completion of Escape ! by entering Vault 112 after the Lone Wanderer leaves Vault 101 . Summary . Tranquility Lane is a virtual reality simulation housed in Vault 112 , created by Dr . Stanislaus Braun . The Lone Wanderer is tasked by Betty with an escalating series of violent tasks ranging from making a child cry to killing residents for Betty ' s entertainment in order to free the Wanderer ' s father , James , from the simulation . As an alternative to completing the violent tasks , the player may activate the " failsafe " . Unlike the murders ordered by Betty ( who can revive the residents at will ) , the failsafe will irrevocably kill everyone . This act of mercy killing will grant good Karma instead of bad , due to the fact that it frees Braun ' s victims from a hellish existence . Both solutions result in the release of the Lone Wanderer and their father from the simulation . Residents . The following are the residents that " live " in Tranquility Lane : Betty ' s tasks . Betty will task the Lone Wanderer to do the following things for " her " entertainment : After everyone is murdered , Braun expresses gratitude for the entertainment and tells the Lone Wanderer what they wanted to know most : Doc is actually their father , and has been watching them in horror the entire time . He then opens the exit door , allowing the Wanderer to leave the simulation . Fail safe summary . Betty ' s negative Karma inducing tasks can be skipped by finding the abandoned house at the beginning of the simulation . Step inside and activate the fail safe using the tones . One can also look at all the other notes written by Braun in here . After activating the fail safe , the residents will be permanently killed by Chinese commandos ( project " communists on US soil " ) . The Lone Wanderer will receive positive Karma , though , because the residents have been freed from their otherwise eternal suffering at Braun ' s hands . Braun , as Betty , will be kept alive and forced to reside alone , forever . However , all of the tasks for Betty can be completed before activating the fail - safe . The Lone Wanderer will gain good Karma and the citizens of Tranquility Lane will be revived and killed by the Chinese soldiers . Outside Tranquility Lane . As soon as the Tranquility Lounger pod opens , James will walk to the Lone Wanderer and begin a conversation . He had intended to find some holodisks , memos , or even experiments from Braun related to the G . E . C . K . , but what he found is a perfectly alive and insane Braun and got himself duped into Tranquility Lane as a dog . After some dialogue , he says he ' ll be returning to Rivet City to meet with Dr . Li and resume Project Purity ; the Lone Wanderer can either immediately go with him or indicate that they ' ve other tasks to attend to . This has no real influence on the plot , and James will leave for Rivet City regardless . This immediately concludes Tranquility Lane and begins The Waters of Life . Similar to the Anchorage Simulation , once Tranquility Lane is exited , it cannot be accessed again .