 From NPR News, this is All Things Considered. I'm Scott Detrow. And I'm Ari Shapiro. Every day across the country, scores of workers toil in trenches, the glorified ditches you see along the highway at large construction sites and new home builds. Without the proper 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