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It has never been mapped - there's all kinds of unknown that awaits you!
The guard lead Marissa to a large steel door.
“These tunnels haven’t been used in years. Remember don’t surface before sunrise.”
He handed Marissa a knapsack with supplies and a flashlight. Flipping on the light, she stepped through the door. “Are you sure you can’t come with me?”
With no answer, he shut the door.