It's about five miles outside the Wall, in the trunk of an inconspicuously normal-sized tree. Once you step on the right trunk, a keypad comes out and you type in the alphanumerical (constantly changing) passcode to be allowed entrance into the tree trunk. After that, you drop down a chute that shoots you out into a on-rails shuttle that takes you the five miles back to the city limits to the underground base.
English
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Nice. By the way, is the slingshot underneath the city.
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Oh, it has to be. People are slung from the slingshot through a four-foot diameter hole at a perfect forty-five degree angle directly into the Sun.
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Alright, I will add it to the list of places to check out for the slingshot.