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He was fully aware of the Vault Experiment program conducted by the Enclave, and has therefore tried to do everything to keep the vault closed for 200 years, just as the program wanted it to be. As it is quite unlikely that he could have been more than 100 years old, the knowledge about the experiment was probably passed to him from the previous Overseer, most likely one of his parents.
When the Vault's only functioning water chip got damaged and shut down, he sent one of the vault dwellers, who later became known as the Vault Dweller, into the wasteland to find a replacement chip. In the course of his adventure, the Vault Dweller ended up defeating the mutant threat, and was subsequently expelled from Vault 13, as the Overseer thought that he would ruin the Vault Experiment by convincing people to leave the Vault.Despite the Vault Dweller's exile, many people chose to follow him into the Wasteland. Although the Overseer tried to stop them, he was eventually tried and sentenced to death for his crime, probably after the dwellers learned about his involvement in the Experiment.
The super mutant pleads with the Lone Wanderer to be released from a cell in Vault 87 in which he has resided for as long as memory permits, imprisoned by his own kind. He claims that he was able to attain literacy and a civilized personality (things most super mutants sorely lack) by gleaning as much information as possible from the vault's immense database which he could access through a terminal in his cell. Out of admiration and a feeling of being in a similar situation he chose to name himself after Guy Fawkes.His intimate knowledge of Vault 87 possibly derives from having been a resident there before being transformed into a super mutant, further indicated by the fact that he wears the remains of a Vault 87 jumpsuit.