to rotate inside the rigid hollow tube 35 with minimal friction the casing 14 is connected to a robot 24 through a pair of mounting brackets 16 each connected to a universal joint 18 itself connected to a second bracket 20 adapted for mounting to a tooling head 22 located at the front end of the robot 24 the tooling head 22 is slidably mounted inside a guiding track 26 of a rotating bracket 28 itself mounted onto a movable arm 30 of the robot 24 the robot 24 is also mounted and supported onto a platform 44 comprising a pair of sliding pads 45 adapted for sliding inside an underground conduit platform 44 and platform 38 are connected together via a tension cable 46 of a predetermined length in operation the electric motor 12 is activated to spin the rotating shaft 32 connected to the first end of the flexible shaft 50 thereby spinning the flexible shaft 50 inside a rigid hollow pipe 34 which in turn spins the drill head 36 connected to the second end of the flexible shaft 50 in order to extend the drill head 36 out of the front end 40 of rigid hollow tube 35 as shown in fig1 a with arrows u2018 b u2019 the movable arm 30 of the robot 24 is adapted to extend in and out of the main body of the robot 24 as shown by arrows u201c a u201d thereby moving the tooling head 22 and the casing 14 of the electric motor 12 in the same direction the moving electric motor 12 pushes the first rigid hollow tube 34 forward inside the second rigid hollow tube 35 as shown in.