Recent reports indicate that Houthi forces in Yemen are making significant advancements in their drone technology. 

According to Conflict Armament Research (CAR), the Houthis are experimenting with hydrogen fuel cells to power their uncrewed aerial vehicles (UAVs). 

This innovation could enable the drones to carry larger payloads and travel greater distances than conventional power sources allow.

The use of hydrogen fuel cells represents a major escalation in Houthi capabilities, potentially making their drones stealthier and more efficient. 

CAR investigators documented a sample of cargo seized by the Yemeni National Resistance Forces (NRF) that included hydrogen cylinders mislabelled as oxygen cylinders, intended for use in UAV fuel cell systems.

These advancements in drone technology pose a significant threat to regional security and highlight the need for increased vigilance and countermeasures by international forces.