Micro-Tunneling is a process of installing sewer pipes.
It enables the installation of sewer pipes known as jacking pipes from one point to another without the need of creating a trench to install them. This is why it is also known as Trenchless Technology.
They are simply jacked - underground - from point A to point B. This means that there is little to no disturbance to traffic or residents. It also helps preserve protected landscape areas.
To further understand the process of micro-tunneling, you can view an animation of the entire process.