If you played Security Breach, You might have found an Underground Freddy Fazbear's Pizzeria...

Sounds Familiar?

Well If you read The Silver Eyes Book You know how Charlie (From Silver Eyes not from the Game) and Her Friends Discovered an Abandoned Freddy's Pizzeria which is under the Mall

Only difference is that in Security Breach it's the FNaF 6 Location, while in the Book It's FNaF 1 Location (i think)