NEW YORK, NY June 07, 2003 —

Click here for a slide showNew York's city water system is losing between 15 and 36 million gallons each day because of leaks in a huge water tunnel that runs from the Catskills to the Bronx. Engineers have known about these leaks in the Delaware Aqueduct for more than a decade. But they couldn't inspect it until this week - when they sent a small unmanned submarine one-thousand feet underground for a peek inside. WNYC's Beth Fertig went to Ulster County for the launch.