Vault 77 Vault 77 is one of the vault series of fallout shelters developed by Vault - Tec . Its location is unknown . History . This vault was constructed in a small cave but it ' s not known when the construction of Vault 77 began . The purpose of Vault 77 in the vault experiment s was to be populated by only one man and a crate full of puppets labeled " P13X U . S . GOVERNMENT ISSUE PUPPET RATION " , as a study of the human condition in near - complete isolation , with a crate of puppets modeled after living beings as sole company . The vault door was designed to close automatically when the only Vault 77 dweller entered , and only to reopen months later . The Vault 77 dweller , later known as the Puppet Man , entered the vault on 23rd October , 2077 when the Great War began . At the one hour mark , he was pounding on the vault door and shouting to anyone who might be listening that they had forgotten all the other vault dwellers . By March 23rd , 2078 , he had been reduced to sitting in front of the vault door and sobbing . On February 4th , 2079 , he discovered and began to inspect the crate of puppets . By February 23 , he had begun to act out simple scenes with these puppets , and by March 30th , 2079 , he had created full roles and histories for them , the dog puppet being named " Reverend Hound " and serving as both sheriff and part - time reverend , and another grandmother puppet which he named " Grandma " . He celebrated the birthday of the " King " with " Grandma " on this day . But before going to bed , a Vault Boy puppet that he ' d missed earlier began to talk to him ( probably a side effect of his isolation and a descent into insanity ) , which the other puppets did not . One morning in 2079 , the " King " was found dead , its head torn off in an act of " regicide . " When the Puppet Man confronted the most likely suspect , the Vault Boy puppet told him that they had , in fact , done it together and must flee before " Reverend Hound " came for them . The Puppet Man , accompanied by the Vault Boy puppet , opened the vault door ( which was no longer locked ) only to find a giant radscorpion holding up a car in each claw . Faced with this , he decided to " sleep on it " before proceeding . By December 2079 , the Puppet Man had managed to leave Vault 77 along with the Vault Boy puppet and a giant ant which he takes as a mount in the wasteland . Vault 77 was thereafter abandoned . List of puppets . List of known puppets from the puppets ' crate and the names given to them by the Puppet Man . Notes . A Vault 77 jumpsuit can be found in Paradise Falls in " Fallout 3 " , alongside an audio recording of an obviously worried slaver , saying how it scares the others and it should be burnt , and that " he " may be back for it . The slavers obviously fear " him " , hinting that it may belong to the vault dweller who killed the slavers who captured him . The jumpsuit appropriately boosts one ' s melee and unarmed skills ( given that these were the Puppet Man ' s ways of murdering ) . Appearances . Vault 77 appears only in the official Fallout webcomic One Man , and a Crate of Puppets . Vault 77 is mentioned in Fallout 3 where a Jumpsuit can be found including a holotape .