For our website visitors not familiar with the term, here's a quote from Wikipedia describing trenchless technology:
Trenchless technology is a type of subsurface construction work that requires few trenches or no continuous trenches. It is a rapidly growing sector of the construction and civil engineering industry. It can be defined as "a family of methods, materials, and equipment capable of being used for the installation of new or replacement or rehabilitation of existing underground infrastructure with minimal disruption to surface traffic, business, and other activities.
― Wikipedia, Trenchless technology, https://en.wikipedia.org/w/index.php?title=Trenchless_technology&oldid=694166162 (last visited Jan. 24, 2016).