China's AJX002 Mine Drone Raises Stakes for Taiwan Supply Routes and Pacific Shipping

A new underwater threat to Taiwan's supply routes

China's AJX002 underwater drone, displayed in Beijing on September 3, 2025, brings together two capabilities that could make a conflict over Taiwan harder to contain: the ability to travel far without a crew and the capacity to plant naval mines along vital shipping routes. The vehicle is estimated to carry roughly 20 mines and travel up to 1,000 nautical miles, approximately 1,800 kilometers, in a deployment.

The drone appeared during a military parade marking the 80th anniversary of the end of the Second Sino-Japanese War. Measuring approximately 18 to 20 meters in length, the torpedo-shaped AJX002 was a centerpiece of the People's Liberation Army Navy's expanding arsenal of autonomous equipment. Its stealthy pump-jet propulsion system is intended to help it move discreetly underwater.

The central concern is where those mines could go. Chinese military analysis describes offensive minelaying around the island arc stretching from Japan through Taiwan to the Philippines. Mines placed in key passages could interrupt the supplies needed by Taiwan and by American and Japanese forces attempting to support it.

A July 2025 report from the Center for Strategic and International Studies (CSIS) gives a measure of the danger. In its Taiwan blockade war games, Chinese submarines and mines working together could destroy up to 40 percent of ships trying to reach the island, even with maximum Taiwanese resistance.

The threat also reaches beneath the shipping lanes. Large underwater drones could be used against the seabed sensors and cables that help the United States track Chinese submarines. Together, these missions point toward a strategy of restricting access above the seabed while weakening the surveillance network below it.

What the AJX002 brings to naval operations

The AJX002 is an extra-large uncrewed underwater vehicle, or XLUUV. In plain terms, it is a large underwater craft that can carry out missions without sailors aboard. Its stated role is offensive minelaying: carrying explosive weapons into waters used by an opponent and leaving them there to threaten passing ships.

The estimated range of 1,000 nautical miles would allow the drone to operate far from Chinese shores without putting a human crew at risk. Its reported capacity of roughly 20 mines per deployment gives a single vehicle the potential to threaten several points along a route, depending on how the weapons are placed.

The AJX002 was not the only large underwater design associated with the parade. Observers also noted a second, larger XLUUV, the HSU100, concealed under tarpaulin during rehearsals. Its appearance suggested that China was developing a family of large underwater drones, rather than relying on one design.

Beijing's public display signaled an intention to extend naval power quietly beneath the surface. Autonomous vehicles offer the prospect of persistent operations at maritime chokepoints, narrow passages through which ships must travel. The strategy envisages a degree of persistence and stealth beyond what traditional submarines can provide for these missions.

Turning the First Island Chain into a barrier

The First Island Chain runs from Japan through Taiwan and south toward the Philippines. For decades, this geographic arc has served as a strategic barrier to Chinese naval expansion into the wider Pacific. Chinese military planners now envisage using its passages to obstruct the United States and its allies.

Analysis published in the Chinese military magazine Shipborne Weapons describes the People's Liberation Army Navy, or PLAN, deploying the AJX002 for offensive minelaying. The proposed mission places mines in international sea lanes to deny opponents access, rather than keeping them in Chinese territorial waters for defense.

The focus includes corridors around Japan's Ryukyu Islands and strategic chokepoints in the Philippines. Blocking those routes would target the logistical arteries that sustain American and Japanese forces during a regional conflict. Ships carrying fuel, equipment and other supplies would face dangerous passages before reaching the area where those resources were needed.

Taiwan's immediate surroundings are only part of this approach. The doctrine prioritizes cutting external supply routes, isolating the island while keeping potential interveners outside the area of operations. Taiwan would then have less room to operate as access to support from farther away became more difficult.

The approach appears inspired by recent activity in the Strait of Hormuz, where the threat of maritime blockades demonstrated the vulnerability of global shipping to asymmetric tactics. Such tactics seek a large effect with relatively limited means. A mine can threaten a ship far larger and more expensive than the weapon itself, while uncertainty about its location can interrupt an entire route.

What the blockade war games found

CSIS examined a potential Taiwan blockade in its July 2025 report. The analysis found that Chinese submarines and mines acting together could destroy up to 40 percent of inbound ships, even under conditions of maximum Taiwanese resistance. Expressed simply, that is as many as four out of every 10 ships attempting to reach Taiwan in the modeled scenario.

The report's analysis, discussed by Bonny Lin and colleagues at CSIS, connects shipping losses with the danger that a blockade could widen into a larger conflict:

China's submarines and mines destroyed 40% of inbound ships to Taiwan, even with maximum Taiwanese resistance. Any blockade creates escalatory pressures that are difficult to contain.

The figure concerns submarines and mines working in concert. The strategic concern is their combined pressure on access to Taiwan: ships must contend with underwater attack as well as explosive hazards along their routes.

The dates place the war game analysis before the public display of the AJX002. The sequence helps explain why the unveiling attracted attention: it showed equipment suited to a form of maritime pressure already examined in the blockade scenario.

• 2022: Government Accountability Office reporting identified problems with the Littoral Combat Ship's mine countermeasures capabilities.
• July 2025: CSIS published its analysis of a potential Taiwan blockade, including losses from Chinese submarines and mines.
• September 3, 2025: China displayed the AJX002 during its Beijing military parade.
• 2025: Further Government Accountability Office reporting described continuing problems with the replacement approach for American mine countermeasures vessels.

How a blockade could stop ships without sinking them

China's proposed use of mines fits into its broader anti-access and area denial strategy, commonly shortened to A2/AD. The phrase means making it difficult for an opponent to enter an area and operate there. Mines can multiply the effect of other forces by making their targets' routes more dangerous and less predictable.

Beijing could layer minefields with missile overflights, exercises involving live ammunition and Coast Guard interdiction. The combined pressure could create a gray zone, a situation involving coercion and confrontation in which the boundary between enforcement and open warfare becomes blurred.

Commercial shipping could stop because of the suspicion of mines, even while the status of a route's clearance remained uncertain. A blockade can therefore disrupt trade without requiring every approaching ship to be attacked. The danger affects the decision to sail as well as the journey itself.

Bonny Lin and colleagues describe a joint blockade campaign involving surface action groups, Coast Guard vessels and covert minelaying. Surface action groups are formations of warships operating together. In the scenario, these forces would intercept ships that refused to comply, while presenting the operation as law enforcement.

Mines would extend the reach of that interception screen. A ship trying to avoid a patrol could still encounter an underwater hazard. Compliance would be backed by a physical barrier, increasing the risk that a confrontation presented as enforcement could escalate into open conflict.

Why seabed surveillance is another target

The United States operates the Fish Hook Undersea Defense Line, a network of fixed seabed sensors stretching from Japan through Taiwan to the Philippines and beyond. The network is designed to track Chinese submarines as they move toward the Pacific.

Chinese naval officers acknowledge in internal military writings that this integrated, three-dimensional surveillance system poses a critical threat to PLAN operations. Its value lies in detecting movements below the surface, where ships and aircraft cannot simply watch a submarine's progress.

Retired U.S. Navy Rear Admiral Mark Montgomery, now a senior fellow at the Foundation for Defense of Democracies, describes the size of the drones and the difficulty of keeping track of them after launch:

These are pretty damn big. You could put a lot of fuel in them. You may or may not see it enter the water in a maritime base, and you don't really know where it's at. Ten hours later, it could be almost anywhere.

Chinese strategists view the Fish Hook network's cables and sensor arrays as an Achilles Heel. Large underwater drones capable of cutting cables, planting explosives or spoofing sensors could weaken American anti-submarine warfare, or ASW. Spoofing means feeding a sensor misleading signals so that it gives a false picture of what is happening.

The AJX002 and related XLUUVs are therefore discussed as more than tools for obstructing ships. Attacking the underwater surveillance network could help Chinese submarines move with less exposure while also supporting a blockade of Taiwan.

The connection to China's nuclear submarines

China's ballistic missile submarines, known as SSBNs, form part of its nuclear deterrent at sea. Their strategic role depends on their ability to survive and retain the capacity to launch missiles. Being tracked makes that task harder.

These submarines are currently constrained to a bastion strategy in the South China Sea. A bastion is an area in which a navy concentrates protection for valuable submarines rather than sending them freely into distant waters. Even there, Chinese ballistic missile submarines remain vulnerable to American attack submarines.

Beijing hopes that opening gaps in American seabed surveillance would allow its nuclear forces to move into the open Pacific. That would complicate American strategic calculations by making Chinese submarine movements more difficult to follow.

The link between minelaying and surveillance attacks is therefore strategic as well as tactical. Weakening the sensor network could assist operations around Taiwan and help protect China's nuclear forces farther from home.

The economic and escalation risks for Beijing

China's proposed minelaying strategy carries serious risks alongside its military advantages. Mining international waters in peacetime or during a crisis carries the risk of being treated as an act of war under international law, with the prospect of major escalation and global sanctions.

China is also the world's largest trading nation by volume, with approximately 90 percent of its commerce traveling by sea. That dependence means a blockade of the First Island Chain would disrupt the maritime routes on which China's own economy relies.

The economic danger follows directly from the geography. A strategy intended to obstruct an opponent's shipping would place explosive hazards in passages serving a much wider trading system. Beijing would face disruption to its own economic lifelines, with potentially catastrophic consequences for its stability over the longer term.

The CSIS warning about escalation adds another risk. Once a blockade begins, efforts to enforce it and attempts to overcome it can generate pressure for further military action. China's ability to create danger at sea would come with limited control over the full economic and military consequences.

America's mine clearance problem

The U.S. Navy's ability to keep routes open depends in part on mine countermeasures, the equipment and operations used to find and clear naval mines. Its plan to replace aging Avenger-class mine countermeasures vessels with the Littoral Combat Ship, or LCS, has encountered technical failures and delays.

Government Accountability Office reports from 2022 and 2025 describe shortcomings in that transition. The LCS has not demonstrated the operational capabilities needed for its mine clearance mission, with equipment failures and immature technologies among the problems cited.

Reliable clearance would be essential to sustaining access to Taiwan through mined waters. The challenge becomes more difficult in a contested environment, where crews and equipment removing mines would operate amid other military threats.

The AJX002's range and mine capacity remain estimates, and the blockade losses are outcomes of a war game. The operational issue they bring into focus is concrete: forces seeking to support Taiwan would need both protection against attack and a dependable way to reopen dangerous shipping routes.

A conflict shaped by these weapons could turn on logistics as much as on clashes between fleets. Cutting supply routes, discouraging commercial voyages and slowing mine clearance could squeeze Taiwan's access to support, while exposing China to disruption of its own maritime trade.

Key Points

• China displayed the AJX002 underwater drone in Beijing on September 3, 2025. It is approximately 18 to 20 meters long.
• The vehicle is estimated to carry roughly 20 mines and travel up to 1,000 nautical miles, approximately 1,800 kilometers.
• Chinese military analysis describes offensive minelaying near the Ryukyu Islands and Philippine chokepoints to restrict access to Taiwan.
• A July 2025 CSIS blockade analysis found that Chinese submarines and mines could destroy up to 40 percent of inbound ships, even with maximum Taiwanese resistance.
• Large underwater drones could also target the Fish Hook surveillance network, helping Chinese submarines move toward the Pacific.
• Approximately 90 percent of China's commerce travels by sea, exposing Beijing to economic damage from disrupted shipping.
• Government Accountability Office reports from 2022 and 2025 identify continuing problems with the U.S. Navy's Littoral Combat Ship mine countermeasures approach.