The Backrooms

You were playing around with your friends, in a abandoned parking lot. You were filming something for fun, messing around and doing random stuff. Suddenly, you no-clip. You fall through the ground when none of your friends are watching. You land in the backrooms level 0, with only a backpack in your possession. Inside said backpack, you have the following: a notepad and some pens, two water bottles, and 3 sandwichs because you and your friends were going to have lunch after playing around. Do whatever you want