 systems in place, those trenches can collapse in an instant, burying those workers alive. A joint investigation by NPR, Texas Public Radio, and the Program 1A finds that more than 250 workers have died in trench cave-ins over the last decade. Those deaths were preventable, experts say. And the Federal Regulatory and Enforcement Agency in Charge of Workplace Safety, OSHA, has done little to hold companies accountable. NPR's Robert Benincasa reports.