Marty Pottenger makes truly underground art. With a camera and a tape recorder, 800 feet beneath New York City, she has documented the lives of hundreds of people building a tunnel 64 miles long and 24 feet in diameter—City Water Tunnel No. 3. The largest nondefense-related public-works project in the Western Hemisphere, the tunnel will bring water to 9 million people in the Naked City when completed in 2025. It has created work for more than 1,000 people and claimed the lives of 24. Pottenger’s multimedia solo show, named after the tunnel, explores the idea of work and the realities of working people’s lives. Footage from different work sites is projected onto the side of an overturned wheelbarrow as Pottenger takes on the identities of different men and women, allowing them to tell us in their own words what this massive project means. And Pottenger speaks in her own voice as well, making poetry out of water, labor, and long days: “It rained tonight as Galileo’s tears boiled hot in my Maxwell House….Where does the black of coffee go? I think of the East River, the Atlantic Ocean, my eighth-grade cloud charts….The last of the liquid cool now, I drink, letting the possibilities of past, present, and future swim, float, dive, and pool together, as if time were just a part of it and water…was the heart.” At 8 p.m. Saturday, March 20, and at 4 p.m. Sunday, March 21, at Dance Place, 3225 8th St. NE. $15. (202) 269-1600. (Holly Bass)