The crowds lined up all day Sunday for Bob Diamond's famous tour of the Atlantic Avenue tunnel.
The tour started up again last summer, after a hiatus of roughly five years.
Diamond discovered the long-lost tunnel -- which runs under Atlantic Avenue between Boerum Place and Hicks Street) in 1981, after hearing about the legend of a Civil War era rail tunnel on a radio show. After an eight-month search (during which he was repeated advised by City officials to give up on his lost cause) he struck gold -- uncovering, intact, the world's first subway tunnel.
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