Unbeknownst to the thousands of people who walk and drive along the busy streets of downtown Brooklyn every day, they are treading on a 165 year old secret. At 17 feet high, 21 feet wide and 1,611 feet long, it is a big secret indeed, and one filled with greed, murder and corruption.

The tunnel, built in 1844 by Cornelius Vanderbilt, was an attempt to avoid incidents of trains striking errant Brooklynites. It was to be the first underground, or "grade-separated" transportation system: the world'­s very first subway.

The work was done almost entirely by Irish immigrants. According to an 1844 Brooklyn Eagle article, when the Irish workers were told by a British contractor they would have to miss church and work on Sundays, an Irishman pulled a gun, shot the Brit, and the group buried him behind the wall of the tunnel - where presumably his body still resides today. In a corrupt deal, the tunnel was capped up and forgotten by the end of the 1850's.

The Atlantic Avenue Tunnel was rediscovered by a curious twenty year old named Bob Diamond in 1980. Diamond found the tunnel by reviewing microfiche at the local library and locating an old blueprint in the borough presidentà­s office. Brooklyn's answer to Indiana Jones, Diamond went down through the manhole, dug through a layer of dirt and broke down the brick and mortar between him and the tunnel.

Today you can still tour the tunnel and Bob Diamond, re-discoverer of the tunnel in 1980, is still giving the tours. You access the tunnel by filing down one by one through a manhole cover in the middle of busy Atlantic Avenue. Diamond is a wellspring of fantastic stories about the origin of the tunnel and how he came to find it. The tunnel is a marvel, and walking through the 165 year old underground passage is an experience like little else in New York.

You can find the time of the next tour at Brooklynrail.net

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