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Thanks @carlgnash everyone really loved how it came out, i am very proud of it in the end. It was such a cool community effort. It was a hard thing to document, I wish i had taken a bit more time with it and used a nicer camera.

It was so fun to see people playing with it, sometimes once folks figured it out they would sit at the mouth of the tunnel yelling into it, playing around with it over and over again!