Direct proof of use
Waterborne improvised explosive devices are directly documented in the 2014 Yemen Civil War through maritime attack reporting and technical investigation. MARAD reported a 30 January 2017 maritime attack against a Saudi frigate near Hudaydah, Yemen, and identified the threat type as a waterborne improvised explosive device. USNI News later reported the U.S. Navy assessment that the craft that hit Royal Saudi Naval Forces frigate Al Madinah was unmanned and remotely guided.
Conflict Armament Research separately examined a 10-meter patrol boat that UAE forces said had been constructed and deployed by Houthi forces in Yemen. CAR described it as a water-borne improvised explosive device with external remote-command equipment and an explosive train built around an RDX charge and a repurposed P-15 Termit anti-ship missile warhead.
Sources: MARAD Southern Red Sea WBIED Alert, USNI Al Madinah Unmanned Boat, CAR Anatomy of a Drone Boat PDF, CAR Anatomy of a Drone Boat Page
Timeline
On 30 January 2017, Al Madinah was struck near Yemen's Red Sea coast. USNI News reported that the attack killed two Saudi sailors and that U.S. Navy officials assessed the attacking craft as an unmanned, remotely controlled boat. MARAD's alert placed the incident near Hudaydah Port and categorized the threat as a waterborne improvised explosive device.
On 5 March 2017, CAR documented a recovered WBIED in UAE custody. Its December 2017 technical report described the base craft as a 10-meter Al Fattan patrol boat originally supplied for Yemeni naval service, with added radio-control, video, GPS, autopilot, throttle-control, and impact-detonation components.
On 30 September 2018, Saudi forces reported that two remote-controlled explosive boats targeted Jizan Port on Saudi Arabia's Red Sea coast. The Maritime Executive reported that the vessels were intercepted and destroyed before impact, while noting that Houthi forces controlled coastline to the south, including Hudaydah, and had used that area for multiple maritime attacks.
Sources: USNI Al Madinah Unmanned Boat, USNI Al Madinah Attack Video, MARAD Southern Red Sea WBIED Alert, CAR Anatomy of a Drone Boat PDF, Maritime Executive Jizan Boats
Narrative
In the Yemen Civil War, the WBIED role was a one-way maritime strike and sea-denial weapon for Houthi-aligned forces. The documented targets were Saudi-led coalition naval and port targets in the Red Sea theater, rather than ordinary possession or display of a small craft.
The recovered CAR-documented craft shows how the category could combine local hull availability with external components. The report says the boat retained its Al Fattan patrol-boat structure and Yamaha outboards, while the conversion added a computerized control unit, camera, GPS antenna, autopilot compass, and throttle-control linkage. CAR did not present the boat as a complete anti-ship missile launcher; the P-15 Termit component was used as a warhead inside the improvised explosive train.
The evidence also separates confirmed use from attribution limits. MARAD and USNI document the Al Madinah attack as a WBIED or unmanned explosive-boat strike near Hudaydah. CAR says UAE forces claimed the recovered WBIED was constructed and deployed by Houthi forces and concludes that multiple evidence strands suggest Houthi deployment, while noting that the exact seizure circumstances were unclear and that Iranian-marked components did not by themselves prove direct Iranian construction.
Sources: MARAD Southern Red Sea WBIED Alert, USNI Al Madinah Unmanned Boat, CAR Anatomy of a Drone Boat PDF, Maritime Executive Jizan Boats
