For a decade, the dominant frame on Chinese commercial maritime power has been expansion. COSCO is buying port stakes in Piraeus, Hamburg, and across the Indian Ocean. The Spratly Backbone Fishing Fleet is swarming reefs. China Merchants Port is building out the Belt and Road. The thesis was always that commercial shipping was becoming dual-use. That argument is now mature and no longer the right frame for what is happening.
The architecture is not becoming dual-use. It already is. The question now is which layers are gaining utility and which are losing it. The visible components, the ones Washington has spent the last seven years sanctioning and lobbying against, are being quietly demoted. The components below the regulatory line of sight are absorbing the operational load.
What is visible
The Asia Maritime Transparency Initiative published its 2025 South China Sea militia data in February 2026. The fleet hit a record daily average of 241 vessels, the highest level since AMTI began systematic monitoring in 2021. The headline number is incorrect. The deployment pattern is what matters.
Civilian Spratly Backbone vessels concentrated at Mischief Reef and Whitsun Reef, away from the contested edges. Fiery Cross, which averaged 32 militia vessels per day in 2024, had almost no observable presence in 2025. The professional militia and the China Coast Guard absorbed the operational load at Scarborough Shoal and Sabina Shoal, where the actual confrontations with the Philippine Coast Guard occurred. AMTI itself called the redistribution a demotion of the fleet’s largest component.
The mechanism is simple. Once a gray-zone instrument is publicly identified as a state instrument, its gray-zone utility decays. The Permanent Court of Arbitration ruled on the Spratly Backbone fleet in 2016. Filipino, Vietnamese, and U.S. analysts have analyzed deployment patterns using commercial satellite imagery. AMTI relies on satellite imagery rather than AIS because so many vessels run dark. The fleet still has mass. It has lost ambiguity.
The same compression is happening at the port layer. The Department of Defense added COSCO Shipping Holdings to its Section 1260H list of Chinese Military Companies on January 7, 2025, naming the firm in a Federal Register notice as qualifying as a Chinese military company under the FY21 NDAA. Lars Jensen at Vespucci Maritime publicly noted that nothing measurable changed in the container market because COSCO had been similarly listed in 2019-2020 with no practical effect. The 67% stake in Piraeus Port Authority stands. The 24.99% Hamburg Tollerort stake stands, after Germany forced the original 35% stake below the strategic-rights threshold under domestic law. No European port has been forced to divest. The CMC listing is regulatory exposure with no operational consequences.
What sits underneath
The depth layer is where the capability is moving. China Ship Scientific Research Center and its State Key Laboratory of Deep-sea Manned Vehicles demonstrated a 3,500-meter cable-cutting device aboard the Haiyang Dizhi 2 research vessel on April 11, 2026. China’s Ministry of Natural Resources confirmed the test through state media. It is the first publicly acknowledged severance capability at that depth by any state. The device, a deep-sea electro-hydrostatic actuator, integrates the hydraulic system, electric motor, and control unit into a single self-contained platform, eliminating the external oil piping that previously required surface-vessel tethering. Officially, the device is for civilian salvage and seabed pipeline work. China Science Daily described the trial as bridging “the last mile from deep-sea equipment development to engineering application.” The dual-use logic is on the surface.
Zhuhai Yunzhou Intelligence Technology, a maritime engineering firm in Guangdong, secured a patent for a towed cable cutting system in January 2025 (CN222242405U). The PLA Navy Institute of Communication Application has held a patent for a deep-sea optical cable shear and retrieval system (CN102358407B) since 2013. The capability was developed in parallel across the civilian and military research bases. What is new is that the operational platforms now exist to deploy it at depth.
Cable repair is the same architecture inverted. S.B. Submarine Systems, a Shanghai joint venture established in 1995, services over 80,000 kilometers of telecommunications cables across the Asia-Pacific. China Telecom holds a 51% controlling stake; the UK’s Global Marine Systems holds the remainder. SBSS has been a service provider for the Yokohama Zone of the Pacific and Indian Ocean Cable Maintenance Agreement since 1997, repairing cables owned by Google, Meta, and U.S. telecommunications providers. According to ship-tracking data reported by the Wall Street Journal in 2024, SBSS vessels have periodically switched off their AIS transponders, going undetected for days at a time while operating around Singapore, Hong Kong, the Yellow Sea, and Taiwan. Ray Powell of Stanford’s SeaLight initiative told Newsweek there is no apparent operational reason for vessels of that size to disable required safety equipment.
The state ownership is not theoretical. China Telecom was effectively expelled from U.S. operations in 2021 by an FCC revocation order grounded in concerns that Chinese national security law obligates Chinese firms to assist state intelligence collection on demand. The same firm now controls the largest cable maintenance operator across the Western Pacific. There are roughly 50 cable repair vessels worldwide capable of operating in deep water. The market is small enough that any single operator running dark for any period is a structural problem.
Why it matters operationally
The U.S. counter-strategy targets the visible. The DoD Section 1260H list designates entities. The FCC’s August 2025 Report and Order on submarine cable landing licenses, FCC 25-49, creates a presumption of denial for cable system operators owned by, controlled by, or subject to the jurisdiction of foreign adversaries, with rules taking effect November 26, 2025. The Pacific Light Cable Network, originally designed to land in Hong Kong, was forced to amputate its Hong Kong leg in 2020 after a Team Telecom partial-denial recommendation; the consortium refiled and received approval for the U.S.-Taiwan-Philippines portions in January 2022. State Department efforts continue to pressure Greece and other host states on Chinese port stakes.
On July 21, 2025, House Homeland Security Subcommittee Chairman Carlos Gimenez, Select Committee on the CCP Chairman John Moolenaar, and House Foreign Affairs Subcommittee Chairman Keith Self sent a joint letter to the CEOs of Google, Meta, Microsoft, and Amazon asking whether the subsea cable systems each company maintains operational involvement in contain components produced, maintained, or repaired by SBSS, Huawei Marine, China Telecom, China Unicom, or Russian-linked entities. The letter is the clearest available statement of Washington’s direction. Not at the cutter. At the contractor.
The actions are real. They are also targeting the part of the architecture whose strategic utility is decaying. The Spratly Backbone fleet’s gray-zone value collapsed when the analytical community indexed its deployment patterns. The Piraeus stake’s coercive utility against Greece is bounded by the fact that Greece is a sovereign EU member with its own port authority. The visible layer is the layer that can be sanctioned. It is also the layer Beijing is willing to demote.
The capabilities gaining strategic utility sit below the line where U.S. sanctions and FCC rulemaking can reach. A cable cutter mounted on a research submersible operates outside any vessel registration regime that OFAC can target. A cable repair vessel running dark in international waters violates no commercial regulation with enforcement teeth. A patent filed by a Chinese maritime engineering firm with no U.S. nexus is not subject to U.S. export controls. The depth layer is not just operationally opaque. It is structurally outside the regulatory perimeter.
The Taiwan Strait is where the layered architecture has been live-tested. Taiwan’s National Security Bureau has documented an average of 7 to 8 undersea cable disruptions annually over the past 3 years, many of which Taiwanese authorities attribute to PRC-linked vessels. In January 2025, a vessel owned by a Hong Kong-registered company severed an undersea communications cable near Taiwan. In 2023, two Chinese vessels were accused of cutting both submarine cables supplying internet to Taiwan’s Matsu Islands, leaving the islands without connectivity for 6 weeks. The pattern is consistent with what the Jamestown Foundation has framed as creative destruction: dual-use civilian platforms exercising capabilities that, in a contingency, would shift from harassment to interdiction.
Conclusion
The architecture you see is the one sanctioned. The architecture being sanctioned is also the architecture losing strategic value. That is not a coincidence. Visibility eliminates ambiguity. Ambiguity is the operational currency. When the currency runs out, the instrument is replaced.
The replacement is happening downward, into capabilities harder to see, harder to attribute, and harder to reach with commercial regulatory tools. The cable cutter, the dark-running repair vessel, the research submersible with patents filed by PLA-affiliated institutes: these are not future capabilities. They exist now.
The hardest question is whether U.S. policy, by concentrating on the visible, has been measuring the wrong thing for the entire decade.