ANALYSIS: AUKUS drones and submarines — how the triangular partnership is reshaping the Indo-Pacific

Introduction: September 15, 2021 to June 22, 2026 — from announcement to demonstration

The partnership that shocked France and alarmed Beijing

On September 15, 2021, Australia, the United Kingdom, and the United States announced AUKUS — a trilateral security partnership that became immediately controversial when it emerged that Australia was cancelling a €56 billion French submarine contract in favour of nuclear-powered submarines supplied by its AUKUS partners. France recalled its ambassadors. The French foreign minister described the cancellation as a "stab in the back." The diplomatic turbulence was real.

Nearly five years later, the outrage has subsided and AUKUS has become a central pillar of the Indo-Pacific security architecture. The June 22, 2026 drone swarm exercise on Salisbury Plain — the most recent visible demonstration of AUKUS operational capability — is the latest evidence that the partnership has moved from political announcement to genuine military cooperation across submarines, autonomous systems, artificial intelligence, and hypersonic weapons.

Two pillars, two timelines

AUKUS operates on two distinct tracks with very different timelines. Pillar I — the nuclear-powered submarine programme — involves a phased transition: Virginia-class submarines purchased from the United States, followed by rotational deployment of American and British submarines to Australian ports, culminating in the jointly developed SSN-AUKUS submarine beginning delivery in the late 2030s. BAE Systems has received a £3.95 billion contract for SSN-AUKUS design work in the UK.

Pillar II is more immediately relevant: advanced capabilities sharing in artificial intelligence, autonomous systems, quantum technology, hypersonics, undersea warfare, electronic warfare, and cyber operations. While Pillar I will reshape the Indo-Pacific balance of power in the 2040s, Pillar II is delivering capabilities now — visible in the Salisbury Plain drone exercise, in the Singapore undersea vehicle project, and in the AI integration being tested across multiple platforms.

The Salisbury Plain exercise — six drones and a strategic message

What happened on June 22, 2026

On June 22, 2026, Australian, British, and American military personnel conducted a coordinated autonomous drone swarm exercise at Salisbury Plain in England. Six drones operated as a unified autonomous unit, demonstrating real-time target designation, cross-platform communication, and autonomous decision protocols that required no moment-to-moment human direction. The exercise was confirmed by the Australian Department of Defence.

Colonel Jake Penley, the British officer overseeing the exercise, described it as validating "the ability to operate as a cohesive autonomous unit across national boundaries." Hing-Wah Kwok of Australia's Defence Science and Technology Group (DSTG) characterised the results as demonstrating cross-domain interoperability — the capacity for platforms built by three different countries, operating under three different command structures, to share targeting data in real time with sufficient precision for autonomous engagement.

The strategic timing

The exercise took place six days after a Chinese floating surveillance platform was spotted near Scarborough Shoal, and three days before North Korea's June 25 weapons tests. The timing may or may not have been deliberately coordinated with those events — military exercises are typically scheduled months in advance. But the effect was to place the demonstration of AUKUS autonomous capability visibly in the context of the specific threats it is designed to address.

The public announcement of the exercise — with named officers, technical descriptions, and Department of Defence confirmation — was itself a strategic communication. China's military planners were the intended audience as much as the general public. The message: Western autonomous systems can operate jointly, at scale, in contested environments. The adversary should factor this capability into its operational planning.

The Singapore UUV project — undersea autonomy at scale

Signature project for uncrewed underwater vehicles

In May 2026, AUKUS partners announced a £150 million UK investment in what was described as a "signature project" for undersea autonomous vehicle technology, following earlier demonstrations at Singapore. The project focuses on large-scale uncrewed underwater vehicles (UUVs) capable of long-range missions in contested maritime environments — surveillance, mine-laying, mine-clearance, and potentially strike operations.

Underwater autonomy is particularly strategically valuable because it operates in an environment where real-time communication is limited — underwater vehicles cannot maintain constant communication with human operators. A UUV operating autonomously for extended periods in contested waters must have onboard decision-making capability sufficient to complete its mission without continuous human direction. Developing that capability requires advances in AI, machine learning, and autonomy architecture that the Singapore project is specifically designed to produce.

Australia's Ghost Shark in context

Australia's Ghost Shark programme — a large autonomous underwater vehicle developed with Anduril Australia — is the national programme that interfaces with AUKUS Pillar II undersea cooperation. Ghost Shark is designed to conduct long-duration missions in the contested waters of the Indo-Pacific — potentially carrying sensors, weapons, or electronic warfare payloads. It represents Australia's bid for sovereign autonomous underwater capability that can operate independently of, while complementing, AUKUS partner systems.

The Ghost Shark and the AUKUS UUV programme are not competitors — they are complementary elements of a layered undersea autonomous architecture. Ghost Shark provides sovereign Australian capability. The AUKUS UUV programme provides shared development and interoperability standards. Together, they are building an undersea autonomous order of battle that China's surface fleet will have to account for in any Indo-Pacific contingency planning.

HyFliTE — the hypersonic dimension

AUKUS's first hypersonic test

The HyFliTE programme — Hypersonic Flight Test and Experimentation — conducted its first test flight under AUKUS in 2025-2026, establishing the partnership's hypersonic weapons development track. Hypersonic weapons — which travel at Mach 5 or above, typically on low, manoeuvrable trajectories — represent a qualitative challenge to existing missile defence architectures, which were designed for ballistic trajectories with more predictable flight paths.

For the Taiwan Strait scenario specifically, hypersonic weapons provide a strike capability that cannot be reliably intercepted by current Chinese air defence systems — Patriot, S-400, or HQ-9 variants — which are designed for different threat profiles. An AUKUS hypersonic capability to strike high-value Chinese military targets — command nodes, surface combatants, anti-ship missile batteries — from outside Chinese integrated air defence range fundamentally changes the first-strike calculus in any confrontation.

China's hypersonic programme and the arms race dimension

China has been developing its own hypersonic arsenal — the DF-17 and DF-21D medium-range hypersonic glide vehicles have been tested and are assessed to be in operational deployment. China's hypersonic programme is more advanced in operational deployment terms than AUKUS partners' current capability — the HyFliTE first test places AUKUS in the development rather than deployment phase of hypersonics.

This capability gap between Chinese deployment and AUKUS development creates a window in which China has hypersonic weapons that AUKUS partners currently cannot reliably intercept and cannot currently match in kind. The strategic significance of this window — and the urgency of closing it — is a core driver of AUKUS Pillar II investment in hypersonics development.

AI on P-8A sonobuoys — the intelligence dimension

Machine learning and undersea threat assessment

One of the more technically significant Pillar II developments has been the integration of artificial intelligence into P-8A Poseidon maritime patrol aircraft sonobuoy analysis. Sonobuoys — acoustic sensors dropped from aircraft to detect submarines — generate enormous volumes of data that traditional human analysis cannot process in real time. AI-enabled analysis allows the P-8A to classify underwater contacts in seconds rather than minutes, providing actionable intelligence on submarine positions at speeds that change operational response options.

The practical consequence is a substantial improvement in submarine detection capability in the Indo-Pacific region. China's submarine force — Type 093 attack submarines and Type 094 ballistic missile submarines — is the primary undersea threat that AUKUS partner anti-submarine warfare is designed to address. Better, faster sonobuoy analysis means Chinese submarines can be found more quickly, tracked more reliably, and targeted more rapidly in a conflict scenario.

The AI governance dimension

AI integration into weapons systems and targeting creates a governance challenge that AUKUS partners have begun addressing through responsible AI use frameworks. The fundamental question — at what point can an autonomous system engage a target without human authorisation — has no settled answer in international law. AUKUS partners have adopted a policy framework that maintains meaningful human control over lethal force decisions, but the practical boundaries of "meaningful control" in high-speed autonomous operations remain contested.

The Salisbury Plain exercise, which demonstrated fully autonomous drone coordination, was presumably conducted under whatever human control framework AUKUS has adopted. But the tension between autonomous operation efficiency and human authorisation requirements is a live operational and legal debate — one that will intensify as the systems become more capable and the engagement timelines shorter.

The Hellscape doctrine and $54.6 billion in autonomous systems

Admiral Paparo's vision and its industrial realisation

The Hellscape doctrine — articulated by Admiral Samuel Paparo of US Indo-Pacific Command — envisions deploying thousands of autonomous systems in the Taiwan Strait to create an environment so hostile that Chinese amphibious forces cannot cross in sufficient numbers before allied defensive forces can be brought to bear. The doctrine is no longer merely conceptual. It is being funded and built.

The Distributed Agile Warship Group (DAWG) programme has a budget of $54.6 billion and targets deployment of more than thirty medium uncrewed surface vehicles by 2030, with a broader fleet of small, medium, and large USVs filling specific roles in the Hellscape architecture. The USV budget increase has been approximately 584% from baseline — a reflection of how seriously American naval planners have taken the lessons of Ukrainian maritime drone operations in the Black Sea.

Ukraine's Magura and the Indo-Pacific connection

The Magura maritime drone — developed by Ukraine for Black Sea operations and used to devastating effect against Russian naval vessels — has been tested in the context of Indo-Pacific deterrence, including in the Philippines. The transfer of Magura technology and operational experience to Indo-Pacific scenarios reflects a recognition that Ukrainian naval innovation — which sank or damaged multiple Russian warships with low-cost autonomous vehicles — has direct applicability to the Taiwan Strait challenge.

The Magura demonstrated that a country without a conventional naval capability could deny sea control to a significantly more powerful navy through autonomous attrition. Taiwan, the Philippines, and other Indo-Pacific partners are studying this lesson intensively. Cheap, plentiful autonomous maritime vehicles — designed to saturate and attrite rather than to engage in symmetric naval combat — represent a genuine equaliser for smaller maritime nations facing a more powerful naval adversary.

China's L30 swarms and Type 093 submarines — the counter-architecture

Beijing's autonomous maritime response

China has not been passive in the face of AUKUS autonomous systems development. In April 2026, Chinese naval forces demonstrated L30 uncrewed surface vehicle swarms deployed from a dedicated 58-metre mothership — showing that China too has invested in autonomous maritime warfare at scale. The L30 exercises mirror the Hellscape concept: autonomous vessels that can saturate an adversary's defensive responses and attrite conventional naval capability.

The convergence of Chinese and Western autonomous maritime doctrine is simultaneously reassuring — in that both sides are making similar technological bets — and alarming, in that it creates the conditions for symmetric autonomous attrition warfare in which escalation management becomes extremely difficult. When both sides have autonomous systems with autonomous engagement parameters operating in close proximity in a contested strait, the probability of unintended escalation rises substantially.

Type 093 and China's undersea strategy

China's Type 093 Shang-class nuclear attack submarines represent the primary undersea threat to AUKUS surface forces and supply lines in any Taiwan contingency. The Type 093G variant is assessed to have reduced acoustic signatures compared to earlier models — though still significantly louder than American Virginia-class or British Astute-class submarines. China's South Sea Fleet submarine base at Sanya, Hainan provides direct access to deep-water approaches to Taiwan and the Philippine Sea.

The coming AUKUS Virginia-class transfers and eventual SSN-AUKUS deployments are specifically designed to address this undersea threat. Australia's location provides a strategic base for submarine operations in the southern approaches to the South China Sea — an angle of approach that complicates Chinese anti-submarine warfare planning and provides AUKUS submarines with operational reach into Chinese maritime approaches without transiting the most heavily monitored waters near Taiwan.

Japan's Pillar II discussions and the Quad-AUKUS interface

Japan's potential AUKUS integration

Japan has been in discussions about participating in AUKUS Pillar II — the advanced capabilities track. Full AUKUS membership requires extraordinary intelligence integration and technology sharing that goes beyond what Japan's current constitutional and legal framework easily accommodates. But Pillar II participation on specific technology tracks — autonomous systems, AI, electronic warfare — is being actively explored as a framework that provides the capability benefits without the full membership complications.

Japan's Pillar II participation would be a significant strategic development. Japan has world-class electronics and AI industry, advanced shipbuilding capability, and a military that has been rapidly expanding its autonomous systems portfolio. Japanese integration into AUKUS Pillar II would add industrial depth to the autonomous systems cooperation and extend the geographic reach of the technology development network to Japan's northeastern Pacific position.

The Quad as political complement to AUKUS operational backbone

The Quadrilateral Security Dialogue (Quad) — Australia, India, Japan, and the United States — provides the broader political framework for Indo-Pacific security cooperation that AUKUS lacks. The Quad is explicitly not a military alliance. It conducts joint exercises, coordinates on infrastructure, supply chains, and vaccines in the Pacific islands, and provides a political forum for four major democracies to align their strategic communications.

AUKUS provides the operational backbone — real weapons systems, real interoperability, real autonomous capabilities. The Quad provides the political coalition — the demonstration that a broader set of democratic stakeholders shares the strategic vision of a free and open Indo-Pacific. The two frameworks are complementary architectures, not competing alternatives. Their combination is more strategically significant than either alone.

The Australia-UK ministerial consultations — June 2026

Beyond submarines — the full security relationship

The Australia-UK Ministerial Consultations joint statement of June 2026 — covering both defence and foreign affairs ministers from both countries — addressed a broader agenda than AUKUS submarines alone. The statement covered space surveillance coordination, cyber defence architecture, intelligence sharing protocols for Indo-Pacific threat monitoring, and specific bilateral commitments in the areas of electronic warfare and signals intelligence.

The breadth of the ministerial statement reflects the evolution of the Australia-UK relationship from a historical partnership built on Commonwealth ties and intelligence sharing (Five Eyes) to a genuinely operational security partnership built on shared threats, shared technology development, and shared deployable capability. The AUKUS framework has provided the institutional architecture that allows the broader relationship to deepen across domains.

UK's £3.95 billion SSN-AUKUS investment

The UK's £3.95 billion BAE Systems contract for SSN-AUKUS design work represents the most significant British naval investment in decades and the cornerstone of the UK's long-term contribution to AUKUS Pillar I. SSN-AUKUS is designed to be a next-generation nuclear-powered attack submarine drawing on British and Australian requirements, incorporating American technology, and delivering capability improvements over any current allied submarine design.

The design contract's scale and the involvement of BAE Systems — the UK's primary naval and defence systems company — signals that AUKUS is not a temporary arrangement contingent on any single government's political preferences. It is a structural commitment of industrial resources and national defence investment that will outlast any political cycle. The submarines being designed today will enter service in the late 2030s and operate through the 2060s. AUKUS is being built for the long term.

Ghost Bat and autonomous air combat

The loyal wingman concept

Australia's Ghost Bat (MQ-28A) — produced by Boeing Australia and developed with Australian government funding — is the leading international example of the loyal wingman concept: an autonomous aircraft designed to operate alongside crewed fighters, extending their sensing and strike reach, absorbing threats, and performing tasks that are too dangerous or too demanding for crewed aircraft.

In the Taiwan contingency scenario, Ghost Bat would be deployed alongside F-35A and potentially F/A-18F platforms flying from Australian or allied bases, extending their effective strike and surveillance range into contested airspace. A crewed fighter escorted by Ghost Bat drones that absorb surface-to-air missile engagements can penetrate deeper into defended airspace than it could operating alone — and does so without risking human crews for the most dangerous portions of the mission.

Australia's $12-15 billion autonomous systems target

Australia's defence investment in autonomous systems is targeted to reach $12 to $15 billion by 2035 — covering Ghost Bat, Ghost Shark, additional drone platforms, and the associated AI, communications, and logistics infrastructure that makes autonomous systems operationally effective rather than technologically interesting. This investment scale places Australia among the top five global investors in military autonomous systems, despite being a relatively small military power.

The investment reflects a deliberate strategic choice: a country of 26 million people cannot maintain credible conventional deterrence through mass alone. Technology multipliers — autonomous systems, AI-enabled decision-making, precision strike at extended range — allow a smaller military to create disproportionate strategic effects. Australia is making that bet explicitly and at scale.

Escalation risks — the autonomous accident scenario

When autonomous systems create unintentional confrontation

The deployment of increasing numbers of autonomous systems in contested maritime and air environments creates a category of risk that human-operated military assets manage through established protocols but autonomous systems handle through algorithms. A Chinese USV and an Australian UUV encountering each other in disputed South China Sea waters, both operating autonomously, is a scenario that existing rules of engagement were not designed to address.

The risk is not that autonomous systems will decide to start a war. It is that they will create incidents — encounters, shadow contacts, defensive manoeuvres interpreted as aggressive — that human commanders are then asked to manage with incomplete information and political pressure for response. The classic escalation dynamics of military confrontation can be triggered by autonomous system interactions without any human intending conflict.

The LAWS regulatory gap

The international community has been discussing Lethal Autonomous Weapons Systems (LAWS) regulation for more than a decade without producing a binding legal framework. A Group of Governmental Experts under the Convention on Certain Conventional Weapons has met repeatedly, discussed extensively, and produced no binding commitments. Both AUKUS partners and China continue deploying increasingly capable autonomous systems in contested environments without agreed rules of engagement between adversaries.

This regulatory gap is not merely an abstract legal concern. It is a practical operational hazard in environments where multiple nations' autonomous systems are operating simultaneously with different engagement parameters, different identification protocols, and different escalation authorisation frameworks. The absence of any agreed autonomous system encounter protocol — equivalent to the Incidents at Sea Agreement that reduced Cold War naval confrontation risk — is a genuine and growing danger.

AUKUS and the broader Western security architecture

Complementing NATO rather than competing with it

A recurring concern about AUKUS in European capitals has been that it represents American strategic attention shifting toward the Indo-Pacific at NATO's expense. This concern is partly addressed by the structure of AUKUS itself: it involves the UK — a core NATO ally — as a full participant, and it is explicitly framed as complementing rather than replacing Atlantic alliance commitments.

The practical argument is that a stable Indo-Pacific — where China is deterred from aggressive action against Taiwan or other partners — is itself a benefit to European security. A Taiwan contingency that draws American military resources fully into the Pacific would leave NATO's eastern flank substantially weakened. Preventing that contingency through credible deterrence is, from a NATO perspective, a contribution to European security even if its geographic focus is Pacific.

The Five Eyes intelligence foundation

AUKUS was built on the existing Five Eyes intelligence-sharing architecture — the United States, United Kingdom, Canada, Australia, and New Zealand. The depth of intelligence integration among Five Eyes partners provided the trust infrastructure on which the AUKUS technology-sharing and joint operations frameworks were built. The June 2026 ministerial consultations explicitly deepened this intelligence-sharing dimension, particularly regarding Indo-Pacific threat monitoring and Chinese military movements.

Five Eyes intelligence cooperation has been central to the surveillance of Chinese activities near Scarborough Shoal, the assessment of Chinese submarine movements, and the real-time sharing of signals intelligence that enables the kind of cross-national autonomous operations demonstrated at Salisbury Plain. The intelligence architecture and the operational architecture are inseparable components of the AUKUS capability.

Where AUKUS goes next

The 2027-2035 development trajectory

The AUKUS development trajectory over the next decade involves several milestones. Virginia-class submarine sales to Australia are targeted for the mid-2030s, contingent on American submarine production capacity scaling to meet both US Navy and AUKUS requirements. The SSN-AUKUS first delivery to the Royal Australian Navy is projected for the early 2040s. Additional HyFliTE tests will advance hypersonic capability toward operational deployment. Ghost Bat will enter operational service with the Royal Australian Air Force. Ghost Shark's operational tests will determine if the programme delivers on its strategic potential.

Pillar II cooperation will continue expanding — with Japan's potential involvement being the most significant near-term development to watch. The Singapore undersea project will produce operational UUVs. AI integration across air, surface, and undersea platforms will deepen. The direction of travel is clear, and the investment is committed. The question is whether the delivery timeline is fast enough for the threat environment AUKUS was designed to address.

The credibility test — deterrence requires more than capability

AUKUS's ultimate value is not in its hardware. It is in the credibility of the signal it sends to potential adversaries. Deterrence requires that the adversary believe the capability will be used if necessary, deployed if necessary, and maintained if challenged. AUKUS's credibility depends on three governments maintaining political commitment across election cycles, three industrial bases delivering on ambitious programme timelines, and the capability demonstrated at Salisbury Plain actually scaling to the numbers required by the Hellscape doctrine.

All of these are achievable. None of them is automatic. Political commitment, industrial delivery, and operational capability must all be maintained simultaneously across a decade of technology development, changing political environments, and potential crises that will test AUKUS partners' resolve before the full capability is in place. The Salisbury Plain exercise was a demonstration. The real test will be whether the demonstrations translate into deployed capability at the scale the threat requires.

Strategic implications and the long view

The structural shift beneath the surface events

The events analysed in this article are not isolated incidents. They represent a structural shift in the strategic environment that has been building across years of incremental change. Understanding any single event in isolation misses the larger pattern — the convergence of pressures, the evolution of doctrines, and the gradual transformation of balances that underlie the headline developments.

That structural shift demands not only tactical responses but a reassessment of fundamental strategic assumptions. The alliances, institutions, and frameworks built in a different era are being tested against a reality they were not fully designed to manage. Meeting that test requires both the clarity to see the structural change clearly and the political will to respond proportionately.

The choices that remain available

This analysis would be incomplete without acknowledging that the choices described are not predetermined outcomes. Political will, sustained institutional commitment, and the decisions of individual leaders still shape how these structural forces resolve. Determinism about geopolitical outcomes is intellectually lazy and practically dangerous — it gives permission to passivity when action is available.

The situations described in this article are serious. They are not hopeless. The democracies, the institutions, and the alliances that constitute the rules-based order have demonstrated resilience and adaptability at critical moments before. Whether they do so again depends on choices that have not yet been made. That is what makes analysis — and the public understanding it aims to foster — worth the effort.

Conclusion: AUKUS as the most ambitious defence partnership since NATO

What AUKUS has actually built

Five years after its announcement — amid French diplomatic outrage, Chinese condemnation, and considerable scepticism about its deliverability — AUKUS has built something real and significant. It has a £3.95 billion submarine design contract. It has a Salisbury Plain drone exercise that demonstrated genuine cross-national autonomous capability. It has a Singapore undersea vehicle project. It has a HyFliTE hypersonic programme. It has an AI integration track across naval platforms. It has an Australian Ghost Bat flying autonomous missions and a Ghost Shark approaching operational testing.

None of this fully addresses the immediate Taiwan contingency threat. The submarines are decades away. The hypersonics need years of development. The autonomous systems need to scale from six drones to thousands. But the foundation is genuinely there — more substantive than its critics predicted in 2021 and more urgent in its relevance than the geopolitical environment of 2021 suggested it would need to be.

The challenge that remains

The challenge AUKUS faces is the challenge of all deterrence frameworks: the adversary's behaviour determines whether the investment was adequate, and that behaviour cannot be known in advance. AUKUS is a bet that credible autonomous, undersea, and hypersonic capability, deployed with three allied nations' political commitment, will make Chinese military action in the Indo-Pacific too costly to be rational. That bet may be correct. It needs to be correct. The alternative — a world in which AUKUS was insufficient, and Beijing moved — is the outcome that billions of dollars, years of development, and decades of political commitment are designed to prevent.

Signed Maxime Marquette, columnist

Columnist's transparency box

My position and what I defend

I support AUKUS as a legitimate and necessary security framework for addressing Chinese military ambitions in the Indo-Pacific. I am concerned about the autonomous weapons escalation risks it creates and believe LAWS regulatory frameworks should be developed urgently. I am a supporter of Taiwan's democracy and right to security. These positions are stated openly and inform my analysis.

Sources and method

My analysis draws on Australian Department of Defence announcements, UK government publications, published academic and policy research on AUKUS, and reporting from specialised defence media. I do not have access to classified programme assessments or confidential military planning documents. Technical capabilities described are based on published reporting, which may not capture the full extent of classified capability development.

Sources

Primary sources

Australian Department of Defence — AUKUS partners test drone swarming tactics — June 22, 2026

UK Government — Australia-UK Ministerial Consultations joint statement — June 2026

Ocean News — AUKUS partners announce landmark uncrewed underwater technology project — May/June 2026

Secondary sources

Australian Minister for Defence — The case for AUKUS — June 22, 2026

NDTV — War games show sea drones are key to defending Taiwan and Japan against China — June 2026

UNN/Bloomberg — Ukrainian naval drones become a new factor in deterring China in the Indo-Pacific — June 2026