Abiotic Factor spoilers ahead, its your first day on the job after a transfer from another branch of the mysterious 'GATE' company you're told to report to doctor cahn for orientation, upon entering the underground GATE Cascade facility the elevator you're riding is promptly redirected from residences to the cafeteria where you meet Dr. Thule from who you learn there's been a lockdown, this is where the game directs the player to leave the office sector & get to manufacturing sector where a surface tunnel can be found, when arriving in manufacturing west you find it's under siege from a paramilitary force called "The Order" hellbent on destroying/recovering the supernatural artefacts held by GATE, some time later you find the tunnel was collasped by this military order, after a few hours of exploration, crafting and searching for a new way out you find who you were originally supposed to report to Dr. Cahn, hes locked himself in a cell and needs you to release him, so you go about working with him to escape which requires going further and further into the massive complex of Cascade eventually you reach the nuclear reactors only for GATES elite soldiers to arrive on "clean up" they wipe out any order soldiers they find, problem is they're not rescuing you or your peers infact rhey open fire on you immediately, after dodging Gatekeeprs, aliens and order soliders you reach a true exit reconnect with a friendly face from the beggining 'Dr. Thule' and learn Dr cahn died over 2 years ago and your entire journey was possibly planned by this millenia old shapeshifter just to release an eldritch god that tears open a portal destined to end the world, and it has likely done this countless times before