The City Below: The Secret Mapping of NYC’s Subsurface

Thu Mar 12 2026 at 06:30 pm to 08:00 pm UTC-04:00

SVA Theatre | New York

Open House New York
Publisher/HostOpen House New York
The City Below: The Secret Mapping of NYC\u2019s Subsurface
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Learn about a groundbreaking and secretive initiative to create the first complete and accurate map of everything beneath NYC's streets.
About this Event

Discover what lies beneath New York City’s streets, and why mapping it matters.

Almost daily, construction crews break ground only to discover gas pipelines, fiber optic cables, or steam mains in the way of vital upgrades. These unexpected findings cost the City millions in delays and pose a threat to emergency management.

To solve this problem, the City is working to create the first complete and accurate map of everything—water and sewer lines, electrical conduits and natural gas pipelines—beneath our city’s streets. This technological feat will bring transparency to the “spaghetti-like jumble” and transform how the city builds, maintains, and protects its infrastructure.

Join Open House New York to hear directly from the New York City Department of Design and Construction (DDC) and partners, which dig up the streets every day to install essential sewers and water mains underground that improve our City. Thomas Wynne, Deputy Commissioner of Infrastructure for DDC, will discuss the massive subsurface coordination effort required between public and private entities to meet the needs of our growing City while keeping the heat on and New Yorkers connected via high-speed internet. Discover how the underground world works and learn why mapping it is an investment in future generations.

Additional speakers to be announced. A moderated conversation with audience Q&A will follow the presentation.


Free Community Tickets are available for New York City residents who are SNAP or WIC recipients or public housing residents, students and teachers at New York City schools, and nonprofit professionals working in the environmental sector and/or serving low-income communities in New York City. To request community tickets, complete this form.


Photo: NYC DDC / Matthew Lapiska

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Event Venue & Nearby Stays

SVA Theatre, 333 West 23rd Street, New York, United States

Tickets

USD 11.49 to USD 16.74

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