Vault-Tec is a fictional corporation in the Fallout video game series, known for its role in creating underground shelters called Vaults. These Vaults were designed to protect people from nuclear fallout and other disasters, providing a controlled environment for survival. The company is often depicted as having questionable ethics, conducting experiments on the inhabitants of the Vaults without their consent. Despite its sinister reputation, Vault-Tec has become an iconic symbol of the Fallout universe, representing both the hope for safety and the darker side of human experimentation.