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"Nah I don't want to go. You have fun though" rule
(slrpnk.net)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
My first and only cave experience was with a friend who had done the tunnel before so he knew where it went and was safe. It was slightly wider than my shoulders and started with climbing a rope up into the tunnel from a river and ended with a T intersection.