This view shows a shot of approximately 16,000 pounds of DuPont 60% gelatin dynamite in the Susquehanna River near Marietta, Pennsylvania. It was one of several blasts made to create a trench in the river bed for the laying of Big Inch, the world's largest oil pipe line. This was the largest single dynamite charge employed, up to that time to build a trench for a pipeline river crossing. A ditch 442 feet long was blasted.
After supervisors and engineers had witnessed the quick, efficient digging of a ditch in Johnson County, Iowa, by DuPont experts, they gave the Go Ahead on a long list of special projects in the area. Some idea of the height (150-180 feet) the muck and mud of the heavily silted stream reached can be had by noting the telephone poles.