e-tool and sandbags for tunneling

I made this video to show how the military surplus "entrenchment tool" and sandbags are useful for tunneling. I order the sandbags from Uline. I prefer green 12x20" bags with 25 pound capacity for their ease of use in confined areas and usefulness in building bullet-resistant fighting positions. https://www.uline.com/BL_5565/Sandbags