Brock Yordy, a drilling industry specialist, walks through the practical engineering of geothermal borehole drilling in this session from MIT's RES.ENV-007, Geothermal Energy Networks, taught during IAP 2025 with HEET. He covers the equipment specifications needed for borehole networks, the drilling methods used to reach target depths, and the real-world challenges of finding contractors qualified to do this specialized work. Rather than staying theoretical, the talk draws on lessons learned in the field, including gaps between what engineers design and what drilling equipment and crews can actually deliver. The session fits into a broader course on geothermal networks as a district-scale heating and cooling solution, but this segment narrows in specifically on the borehole construction process itself, the step that turns a geothermal design on paper into holes in the ground.