Although we are not skilled to work in city traffic, sometimes it happened to be able to carry out these works.
In this case we had to dig a trench to lay concrete pipes with size of more than two meters of diameter!
The most critical part was the crossing /with microtunneling) of one of the main access roads to the city. It 'was necessary to make holes to accommodate the "moles" to the two sides of the road at a depth of about four meters occupying as little space as possible to limit the impact on traffic!
A beautiful experience that are needed in addition to the technique, also the organization, logistics management for acquiring materials and coordination with the various teams involved in the various phases of work!