Within most of these Overseer-governed vaults, Vault-Tec carried out human experiments on its residents without their consent or knowledge, ranging from being mostly harmless to disturbing and inhumane.

Vault-Tec is a pre-war defense megacorporation responsible for creating the vaults featured throughout the Fallout series.

[3][4][5] Despite its slogan "revolutionizing safety for an uncertain future,"[6] Vault-Tec is consistently portrayed as a corrupt,[7] unscrupulous corporation with themes of unfettered capitalism.

[8] These vaults served as large fallout shelters used to house civilians and allow for human life to continue in the potentiality of the U.S. being in immediate threat of a nuclear attack.

[9] These vaults were Overseer-governed,[8] with Vault-Tec carrying out human experiments on its residents without their consent or knowledge,[9] which ranged from being mostly harmless to inhumane and disturbing.

[13] Additionally, "Among the Stars" is a Vault-Tec amusement park attraction in the Fallout 4: Nuka-World expansion pack.

[45][47] High-ranking employees of the corporation, including Hank, were cryogenically frozen inside of Vault 31, as discovered by Norm MacLean (Moisés Arias).

[53][54] In 2008, as part of a marketing campaign for Fallout 3, a collector's edition version of the game was released, which included a Vault-Tec lunch box.

[59] Vault-Tec has been placed in several top-ranking lists for evil corporations within video games, including by The Guardian,[60] GamesRadar+,[61] PC Gamer,[62] and TheGamer.

[63] Sarah Milner of Polygon described Vault-Tec as having "little interest in saving the population – its corporate leadership was playing the long game, using the majority of the Vaults to conduct social experiments and scientific research, free from the restraints of regulations or ethics.