A ship needs a stack to ventilate its engines, etc, so what can you do with that area of the ship. Well, some clever person thought to put a rock climbing wall on the outer surfaces of the stack. The ship provided special shoes for climbing and a staff member to assist you with a safety rope and harness as you climbed up or down. I saw people of all ages (well, kids to say age 50ish) give the wall a try.
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