As of early 2026, the deployment of hydrogen-powered drones like the Zepher Z1 has marked a revolutionary shift in aerial reconnaissance and stealth. These platforms replace traditional internal combustion engines with high-efficiency hydrogen fuel cells, allowing for near-silent operation at altitudes up to 12,000 feet. By converting hydrogen into electricity via a chemical reaction, these drones achieve long-range endurance that far exceeds traditional battery-powered systems. This propulsion