Makeshift Trench Tool
When you don’t have a tool, the best option could just to just make one out of typical wood shop tools.
I had to dig a 2 in. wide x 6 in. deep x 50 ft. long trench for low-voltage wire between my rock walkway and landscape rock planting area. I started with a trowel and then moved to 2 in. wide x 12 in. long pry bar on my hands and knees, not great for my old knees and slow. An idea came to mind, why not mount the pry bar on an old hoe handle I had in the garage? So that’s what I did and it worked great! — Don Tumminia