A Fallout 4 player has speculated on a sinister backstory tying Vault-Tec’s experiments and Sanctuary Hills together. Fallout 4, developed by Bethesda Game Studios, is set in a post-apocalyptic world ravaged by nuclear war. Players assume the role of the Sole Survivor, emerging from Vault 111 after being cryogenically frozen for over 200 years. The game is renowned for its expansive open-world exploration, intricate storytelling, and immersive role-playing elements.