What is a Keyhole Technique.
"Keyholing" is the process of making a small, precisely controlled excavation to access buried utilities.
The technique provides location, inspection, repair, maintenance, and installation of utility facilities via the use of specialised tools.
The Keyhole technique allows anyone involved in infrastructure repair, maintenance etc. to cost-effectively expose and perform work on their underground pipe and other facilities without resorting to more costly and disruptive conventional excavation methods.