Robotic Self-Anchoring Cliff Face Spider Drill Model

Underwrite 4-legged tethered robotic spider drills rappelling down 90-degree sheer mountain cliffs and unstable highway rock cuts (drilling 100mm tieback anchor holes 20m into granite and injecting chemical grouting with zero scaffolding or human roped workers). Model cliff stabilization geotechnical contracts ($450/meter drilled), and fleet payback.