Burrowing for 137 kilometers (85 miles) beneath New York, the Delaware Aqueduct holds the title of the world’s longest continuous tunnel. This incredible feat of engineering quietly delivers famously quaffable water to millions of New Yorkers every day, but few realize the scale and complexity hidden deep beneath the Earth. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

The Delaware Aqueduct is a circular tunnel measuring 4.1 to 5.9 meters (13.5 to 19.5 feet) in diameter that carries fresh water from the Rondout, Cannonsville, Neversink, and Pepacton reservoirs towards New York City . On its journey, it snakes southward beneath the Hudson River and ends at the Hillview Reservoir in Yonkers, the final stop before distribution.

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