A bell hole is a hole dug into the ground over or alongside a pipeline to allow the line to be examined and to provide room for workmen to perform maintenance on the pipeline.
A splice pit is a hole dug is a hole dug into the ground over or alongside an electrical cable to allow the cable to be examined and to provide room for workmen to perform maintenance on the electrical cable.
Using hydro excavation to dig bell holes and splice pits creates a clean hole that workers can easily access to make repairs.