Indestructable (SCP Story)

Site-971 has always been a relatively peaceful site. It's classified as a safe site, and quite a lot of people come here every day to start their jobs.
But it is no longer peaceful. With the arrival of a strange group that call themselves "Exterminators" or the Ext and several hazardous/anomalous events, Site-971 can no longer be classified as safe.

Katherine and Cassini have been normal people all their lives, until Cassini was kicked out of her college, accused of setting it on fire. Multiple lawsuits and police encounters later, they don't have much more than sixty dollars in their bank account. Until they're offered a huge salary at a mysterious place called Site-971. Their only rule is to never reveal the identity of the Foundation.

But they discover that there is much more than meets the eye in the Foundation. The deeper they go, the more secrets about Site-971 they encounter, leading them to wonder if they need to run.