This method allows the construction of a blind microtunnel with the recovery of the drilling unit from the entarnce shaft, avoiding the construction of an exit shaft.

We use an integrated system that consists in a special drilling kit with an appropriate size of the drilling unit,  slightly thicker than the pipes placed, that at the end of drilling operations will be removed from the drilling unit thanks to a special hydraulic system. The external kit remains in the ground while the drilling machine is recovered through the pipes placed in the entrance shaft.

The construction of blind microtunnels could be a successful technique when further drilling operations are required from the main pipe.