The Rise of Maritime Drones: From Surveillance to Weaponization

Maritime drones — encompassing unmanned aerial vehicles (UAVs), unmanned surface vessels (USVs), and unmanned underwater vehicles (UUVs) — have transformed from niche surveillance tools into front-line weapons systems that are actively reshaping naval warfare and port defense. The weaponization of maritime drones represents one of the most significant shifts in maritime security since the advent of anti-ship missiles, and it is happening at a pace that outstrips defensive countermeasures.

In 2025 alone, Houthi forces deployed over 80 one-way attack drones and USVs against commercial shipping in the Red Sea. Ukraine used maritime USVs to strike Russian naval vessels in the Black Sea, sinking or disabling multiple warships. And intelligence agencies have flagged the proliferation of drone technology to non-state actors in the Gulf of Guinea and Southeast Asia.

What Are Maritime Drones?

Maritime drones are uncrewed platforms designed to operate on, above, or below the water's surface. They fall into three broad categories:

Unmanned Aerial Vehicles (UAVs) operate above the sea surface and range from small quadcopters used for ship inspection to long-range fixed-wing platforms capable of carrying explosive payloads over hundreds of kilometers. The Houthi Samad-series drones, derived from Iranian designs, have demonstrated ranges exceeding 1,500 kilometers.

Unmanned Surface Vessels (USVs) operate on the water's surface. These range from small jet-ski-sized explosive boats to larger autonomous vessels designed for surveillance, mine countermeasures, or logistics. Ukraine's Sea Baby USV, which has struck targets across the Black Sea, represents the current state of the art in weaponized USVs.

Unmanned Underwater Vehicles (UUVs) operate beneath the surface and include both remotely operated vehicles (ROVs) and autonomous underwater vehicles (AUVs). While most UUVs remain in the survey and inspection role, the potential for weaponized underwater drones targeting port infrastructure is a growing concern for defense planners.

How Did Maritime Drones Become Weapons?

The path from surveillance to weaponization followed a predictable trajectory driven by three factors.

Cost Asymmetry

A one-way attack drone costs between $10,000 and $50,000 to build. The ship it targets may be worth $50 million to $200 million. The defensive systems needed to counter it — electronic warfare suites, close-in weapon systems, directed energy weapons — cost millions per installation. This asymmetry makes drone attacks economically rational for any adversary, from state militaries to insurgent groups.

Technology Proliferation

Iran has been the primary proliferator of maritime drone technology, supplying designs, components, and complete systems to the Houthis, Hezbollah, and Iraqi militia groups. Chinese commercial drone technology has also found its way into military and paramilitary applications globally. The result is that capable maritime drone systems are now available to actors across the conflict spectrum.

Proven Effectiveness

The Ukraine-Russia conflict provided the definitive proof of concept. Ukraine's naval drone program, operating USVs armed with explosive warheads, successfully struck the Moskva (leading to its sinking), damaged multiple patrol vessels, and attacked the Kerch Bridge and port facilities at Novorossiysk and Sevastopol. These results demonstrated that small, inexpensive drones can defeat sophisticated naval defenses.

Why Are Maritime Drones a Threat to Ports?

Ports and terminals present ideal targets for maritime drone attacks for several reasons.

Fixed, high-value infrastructure. LNG terminals, crude oil storage facilities, and container cranes cannot maneuver or evade. They are static targets with known locations.

Waterside exposure. Ports have extensive waterfront perimeters that are inherently difficult to secure against small, fast-moving surface or subsurface threats.

Limited detection capability. Most port surveillance systems are designed to detect large vessels, not small USVs with minimal radar cross-sections or low-flying UAVs approaching at wave-top height.

Cascading consequences. A successful drone strike on an LNG terminal or oil storage facility could trigger explosions, environmental contamination, and prolonged port closure. The economic and human cost would be orders of magnitude greater than the cost of the attack.

How Are Ports Defending Against Drone Threats?

Port defense against maritime drones is still in its early stages, but several approaches are emerging:

• Multi-sensor surveillance combining radar, electro-optical/infrared cameras, and acoustic sensors to detect small targets that any single sensor might miss.
• Electronic warfare systems that can jam drone communications and navigation, forcing them to lose control or revert to a default behavior that can be exploited.
• Counter-UAS kinetic systems including directed energy weapons (lasers) that can disable drones at ranges up to several kilometers without the collateral damage risk of conventional munitions.
• AI-driven threat classification that can distinguish between a recreational drone, a commercial survey UAV, and an inbound weapon based on flight characteristics, radar signature, and behavioral patterns.

BIMCO and the International Association of Ports and Harbors (IAPH) have both published guidance on drone swarm defense for critical maritime infrastructure, though implementation remains uneven.

What Does This Mean for Port Security Teams?

Port security professionals must now plan for a threat that did not exist in practical terms a decade ago. The ISPS Code, last substantially updated in 2004, does not address drone threats. National maritime security regulations are beginning to catch up — the US Coast Guard issued a Maritime Security Directive on counter-UAS in 2025 — but most port facility security plans remain focused on conventional threats.

The integration of AI-driven surveillance platforms that can detect, classify, and track small airborne and surface drones is becoming essential for any terminal handling high-consequence cargo. This is no longer a future problem — it is a current operational requirement.

Key Takeaways

• Maritime drones have evolved from surveillance tools to proven weapons systems, with demonstrated effectiveness against both naval vessels and port infrastructure.
• Cost asymmetry strongly favors the attacker: a $20,000 drone can threaten a $200 million vessel or a billion-dollar terminal.
• Ports are particularly vulnerable due to their fixed locations, extensive waterside perimeters, and limited detection capabilities against small targets.
• Effective defense requires multi-sensor detection, electronic warfare capabilities, and AI-driven threat classification.
• Port security plans and ISPS assessments must be updated to address drone threats as a current, not hypothetical, risk.