The Tunnel, Stands Awakening Wiki

The tunnel is well a normal tunnel though from afar you can see that there are red eyes peeking outside of the tunnel. With a sign saying "DANGER DO NOT ENTER." If you teleport inside of the tunnel with a stand like KCAU, you will not see anything inside of it. It is a great hiding spot however. Purely map decoration currently. (possibly may be the lead to a map extension or a boss spawn.)

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