Beyond the Trench: Subsurface Protection as the Deliberate End-State in Drone-Saturated Warfare

Beyond the Trench is an independent military concept paper examining whether improved surface trench systems remain an adequate deliberate defensive end-state in environments saturated by small unmanned aircraft systems (sUAS). The paper argues that trenches should remain the immediate fighting and access layer, while subsurface infrastructure should increasingly be considered the protected backbone of mature defensive positions where physically feasible. It examines observation, channelization, attack geometry, electronic warfare, fiber-optic FPV drones, robotic excavation, resilience, and adversary cost exchange, while intentionally leaving detailed engineering solutions open for further experimentation and development.