Source: UnderwaterTimes
January 3, 2012

"MARATHON, Florida Keys -- Advanced divers seeking to celebrate the 100th anniversary of the Florida Keys Over-Sea Railroad's completion can do so by exploring an artificial reef derived from part of the original railroad bridge sunk off Marathon.

Henry Flagler's Over-Sea Railroad, lauded on its completion as the most unique railway in the world, connected the Florida Keys with mainland Florida and each other for the first time in 1912. Portions of its structure, which subsequently served as a foundation for a portion of the original Florida Keys Overseas Highway, lie submerged in 115 feet of water approximately 3.7 miles off Sombrero Lighthouse."

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