To expedite sub-surface trenching and protect lawns, try this tool
Hand-held EdgeAll allows sub-surface trenching through manicured lawns, while protecting lawns appearance. Boasts sharp, 8-in. blade, made of iron. Creates neat, deep, and narrow channel for wiring or piping installations. Just use rocking motion to achieve desired size and depth of channel; insert wires or pipes; and tamp parted earth back into place. Leaves lawn unscathed, without any visible sign of turf disturbance. Tool measures 5 ft. long, weighs 13 lbs., and has 53-in. steel handle. Also ideal for installing landscape edging, removing weeds from driveways, cutting sod patches, squaring off trench bottoms for foundations, or scraping ice and snow.