Steering of the opening is achieved from the work of a rather bent or “steerable” downhole motor (now the technology of directional drilling has improved by the usage of the “RSS: Rotary Steerable Process” that permit to steer an hole continuing the rotation in the drilling string. The RSS https://drill45443.blogzet.com/the-smart-trick-of-drill-that-no-one-is-discussing-43916654