EnclaveForever
It Wandered In From the Wastes
Alesia said:especially if you finish with Amata as overseer,
Amata as Overseer? That's like appointing Frank Horrigan (UNITED STATES SECRET SERVICE) in charge of "humanitarian" aid in Freeside. As far as I'm concerned, 90% of all the characters presented in Fallout 3 in Vault 101 were anti-social anyway (possibly due to insufficient Vitamin D?). Their responses with the character throughout the story is absolutely ridiculous, they blame you for everything, including rising social tensions by those "rebel without a cause" leather-wearing chumps. Even if you comply with the Overseer (with the inclination that you did not kill the original before leaving), they act with nothing, but hostility and exile you yet again. There is no benefit from helping the vault in the long run, the social experiment was never really successful because they went against company orders and were still able to open the door with ease (Vault-Tec would've made sure those doors are incapable of opening). Even the Enclave offered them amnesty (a truly mighty gift) in exchange to opening the vault to the Enclave (going on the basis that the Enclave were planning on merging the occupants with the United States government instead of enslaving them/killing some as seen in Fallout 2), yet they refused and would rather suffer for generational eternity in extreme socially stressful conditions which have already been destroyed by mass salem-like hysteria.
I guess overall, Fallout 3 made it quite clear to the player that the vault was lost as soon as the majority became aware that an occupant left the vault (referring to the Lone Wanderer's father), which ultimately caused the entire vault to go to hell. Like I stated above, I really think the door would not be able to open unless activated by a third-party from the inside (i.e Vault-Tec or the Enclave) in a more lore-strict version, as the vaults in the previous games which did have "flaws" were forced to have such flaws. Vault 101 is an illusion in which appears to be a social experiment, testing long-term generational isolation, but instead can be opened freely anyway.