Subterrene military transport feasibility

Subterrene military transport refers to the use of self-boring vehicles to move personnel, equipment, or signals through the Earth's crust Verified Answer #1. As of August 2026, a self-boring vehicle capable of transporting troops or heavy cargo across hundreds or thousands of kilometers is not considered realistically viable on military timescales Verified Answer #1. While such technology is not forbidden by physics, it would function as an extremely slow tunnel-construction project rather than a maneuver vehicle comparable to a submarine or aircraft Verified Answer #1.

Proposed Concepts

Palmer Luckey has proposed that the upper crust be utilized as a three-dimensional maneuver space for weapons, infrastructure, and other payloads Verified Answer #1. His central argument suggests that autonomy can eliminate the need for large crew compartments, allowing for very narrow, "snake-like" vehicles Verified Answer #1. One extreme illustration of this concept involves a vehicle approximately 100 kilometers long and only one millimeter wide Verified Answer #1.

Feasibility Assessment

The viability of subterrene systems depends heavily on the scale and intended use of the technology Verified Answer #1.

Unmanned Tactical Systems: Small, autonomous machines boring narrow routes for sensors, fiber cables, or munitions are considered a plausible research direction Verified Answer #1.
Existing Infrastructure: The use of robots moving through existing tunnels is currently assessed as viable Verified Answer #1.
Pre-war Networks: Underground railway or logistics networks constructed before a conflict are technically feasible but remain fixed and extremely expensive Verified Answer #1.
Small Cargo: Transporting small unmanned cargo through prepared narrow conduits is potentially viable Verified Answer #1.
Large-Scale Maneuver: Self-boring vehicles intended to carry soldiers or bulk cargo across continental distances during active warfare are not realistically viable Verified Answer #1.