The men, whose names were not released, got trapped in a manhole at U.S. Highway 70, near Leesville Road, shortly before 6 p.m. They worked for Triangle Grading and Paving, based in Burlington.
Coworkers dialed 911, but by the time firefighters arrived on the scene, the men were already dead, authorities said. Their bodies were recovered around 9 p.m.
The Durham County Sheriff's Office is investigating, and the state Department of Labor has been notified.
Triangle Grading and Paving was cited by the U.S. Occupational Safety and Health Administration in January 2010 for exposing employees to work hazards while working in an eight-foot trench at Fort Bragg.
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