Subterrene device could tunnel and destroy targets
An American engineer Clifford P. Marye proposes the subterrane a torpedo shaped underground engine that can worm through earth to reach and devastate enemy trenches forts and cities It travels 5 to 100 feet per hour weighs 40 tons and is powered by remote electric lines with a no surface signature and no detonator used in propulsion The French Government has reviewed the device with interest as a potential decisive factor in the war