The game is set in a containment site of The SCP Foundation, a secret organization dedicated to containing and researching creatures, items and places that threaten the normality of the world. You're thrown into the boots of a Class D, one of the Foundations disposable human guinea pigs. Unfortunately things hit the fan, a massive containment breach occurs and you end up alone in the darkness with the escaped entities roaming around the facility.
Your goal is to make it out alive. You can also attempt to search the facility for documents and other clues to figure out what led to the breach, and do your part in fixing the situation.