The AUKUS Submarine Deal Will Cost $368 Billion. Here's What Australia Actually Gets.

Three hundred and sixty-eight billion Australian dollars. That's AUD $368 billion — roughly USD $245 billion at current exchange rates. It is the most expensive military procurement program in the Southern Hemisphere's history, and one of the largest defense investments any nation has undertaken since the end of the Cold War. What does Australia get for that money? Nuclear-powered attack submarines it has never operated before, built using technology it doesn't currently possess, delivered on a timeline that stretches into the 2050s. And somehow, despite the staggering cost and complexity, the AUKUS submarine deal might be the most strategically rational defense decision Australia has made since World War II.

Why Australia Needs Nuclear Submarines

The answer is geography. Australia sits at the bottom of the Indo-Pacific, roughly 3,000 nautical miles from the South China Sea — the body of water that dominates the strategic calculations of every Pacific nation. Australia's current submarine fleet — six Collins-class diesel-electric boats built in the 1990s — has a range of approximately 11,000 nautical miles and a top speed of 20 knots submerged. That sounds impressive until you consider the distances involved.

A Collins-class submarine departing from HMAS Stirling in Western Australia takes approximately 10-14 days to reach operating areas in the South China Sea, depending on speed and route. It must snorkel regularly to recharge its batteries, creating vulnerability to detection. Once on station, it has limited endurance before it must return home. The round trip consumes a month or more, meaning that each submarine spends more time transiting than operating.

A nuclear-powered submarine changes this equation fundamentally. Nuclear boats don't need to surface to recharge batteries. They can transit at 25+ knots submerged continuously, reaching the South China Sea in roughly a week. They can remain on station for months — limited only by food supplies and crew endurance — without surfacing or snorkeling. A fleet of nuclear submarines gives Australia the ability to maintain a persistent submarine presence in distant operating areas, rather than the intermittent presence that diesel boats can sustain.

The Three-Phase Plan

The AUKUS submarine pathway, announced on March 13, 2023, is structured in three phases. Each phase addresses a different timeline and capability gap, creating a bridge from Australia's current diesel submarine fleet to a future fleet of nuclear-powered boats.

Phase 1: Submarine Rotational Forces (2023-2027)

U.S. and British nuclear submarines are making increasingly frequent visits to Australian ports — particularly HMAS Stirling, the Royal Australian Navy's submarine base near Perth. These visits serve multiple purposes: they demonstrate the operational utility of nuclear submarines in the Indo-Pacific, they familiarize Australian naval personnel with nuclear submarine operations, and they begin the process of building the infrastructure needed to support nuclear boats at Australian facilities.

By 2027, the U.S. plans to establish a rotational submarine presence at HMAS Stirling — meaning U.S. Navy submarines will be forward-deployed to Australia on a continuous basis, similar to how U.S. forces rotate through bases in Japan and Guam. A British submarine will also participate in these rotations. Australian sailors will begin embedding on U.S. and British submarines, learning the skills needed to operate nuclear-powered boats.

Phase 2: Virginia-Class Purchase (2032-2038)

This is the most controversial element of the deal. The United States has agreed to sell Australia 3-5 Virginia-class fast-attack submarines from its own production line. These are not new-build boats for Australia — they are submarines that would otherwise have gone to the U.S. Navy, diverted to Australia to fill the gap between the Collins-class retirement and SSN-AUKUS delivery.

The first Virginia-class boat is expected to be delivered to Australia in the early 2030s. Australia will pay approximately AUD $3 billion per submarine, plus the costs of crew training, maintenance infrastructure, and lifecycle support. The Virginia-class boats will give Australia an immediate nuclear submarine capability while the longer-term SSN-AUKUS program matures.

The obvious question: why would the United States give up submarines from its own fleet, when the U.S. Navy is already short of attack submarines and struggling to produce them fast enough? The answer is strategic. The U.S. calculates that Australian nuclear submarines operating in the Indo-Pacific contribute more to deterrence than the same submarines would contribute if they remained in the U.S. fleet. Australia brings geographic position (close to the South China Sea), alliance credibility (a Five Eyes partner operating nuclear submarines sends a powerful signal), and burden-sharing (Australia pays for the boats and crews, reducing the U.S. Navy's operational load in the region).

Phase 3: SSN-AUKUS (2040s-2060s)

The long-term solution is a new submarine class designed jointly by the United Kingdom and Australia, designated SSN-AUKUS. This boat will use a British-designed nuclear reactor (from Rolls-Royce) integrated into a hull designed to accommodate both British and Australian requirements. The UK will build its variant at BAE Systems in Barrow-in-Furness, England. Australia will build its variant at the Osborne Naval Shipyard in Adelaide, South Australia.

The SSN-AUKUS will incorporate American combat systems — weapons, sensors, and combat management software — with British propulsion. This hybrid approach leverages each nation's strengths: Britain's experience with compact submarine reactors (Rolls-Royce has been building submarine reactors since the 1960s), America's combat systems technology (the AN/BYG-1 combat management system and weapons like the Mark 48 torpedo and Tomahawk cruise missile), and Australia's determination to build sovereign submarine construction capability.

The first British SSN-AUKUS is expected in the late 2030s. The first Australian-built boat is targeted for the early 2040s. Australia plans to build at least eight SSN-AUKUS submarines in Adelaide, establishing a continuous submarine construction program that will sustain Australian shipbuilding for decades.

Where the $368 Billion Goes

The price tag is staggering — but it's spread across three decades and covers far more than just submarines. The AUD $368 billion figure (in constant 2022-23 dollars) includes:

• Submarine construction: The Virginia-class purchases and SSN-AUKUS builds account for the largest share. Each SSN-AUKUS is estimated to cost AUD $6-8 billion.
• Infrastructure: HMAS Stirling is being massively expanded to support nuclear submarine operations, including new wharves, maintenance facilities, nuclear-rated dry docks, and waste handling facilities. The Osborne shipyard in Adelaide is being rebuilt to construct nuclear submarines.
• Workforce: Australia needs to train thousands of nuclear-qualified personnel — submariners, engineers, reactor technicians, and maintenance specialists. The country has no nuclear power industry and no experience operating nuclear naval propulsion. Building this workforce from zero is one of the most challenging aspects of the program.
• Lifecycle costs: Nuclear submarines require periodic reactor refueling, specialized maintenance, and eventual decommissioning and disposal. These costs extend decades beyond initial delivery.
• U.S. submarine industrial base contribution: Australia has committed AUD $3 billion to invest in the U.S. submarine industrial base, helping to expand American submarine production capacity. This investment helps offset the impact of diverting Virginia-class boats to Australia.

The Political Controversy

Within Australia, the AUKUS submarine deal generates fierce debate. Critics raise several objections. The cost is enormous — AUD $368 billion represents a significant fraction of Australia's annual GDP, sustained over three decades. The timeline is uncertain — delays in submarine programs are the norm, not the exception, and slippage could leave Australia with a capability gap between Collins-class retirement and SSN-AUKUS delivery. Nuclear sovereignty concerns are real — Australia will operate nuclear reactors but has no domestic nuclear power industry and limited nuclear regulatory infrastructure.

Supporters counter that the strategic imperative is clear: the Indo-Pacific security environment is deteriorating, and diesel submarines cannot provide the range, endurance, and speed that Australia needs to contribute meaningfully to regional deterrence. The cost, while enormous, is comparable to other major defense acquisitions when measured as a percentage of GDP over time. And the alliance benefits — deepened integration with the U.S. and UK, access to advanced technology, and enhanced deterrence credibility — extend well beyond submarines.

What AUKUS Means for the Submarine Balance

In pure numbers, AUKUS shifts the submarine balance in the Indo-Pacific. By the 2040s, Australia could operate 8-10 nuclear attack submarines alongside the U.S. Navy's fleet (currently targeting 66 attack submarines) and the Royal Navy's Astute and SSN-AUKUS boats. Combined, this gives the AUKUS partners a nuclear submarine fleet in the Pacific that substantially outnumbers any potential adversary's submarine force in the region.

More importantly, the AUKUS submarine pathway creates a level of alliance integration that goes beyond any previous defense partnership. Australia, the UK, and the U.S. will share reactor technology, combat systems, and submarine operating procedures. Australian, British, and American submarines will be interoperable to an unprecedented degree — able to share intelligence, coordinate operations, and potentially use each other's maintenance facilities.

The Risks That Keep Planners Up at Night

The AUKUS submarine pathway has several critical risk points that could derail or delay the program:

The "submarine valley of death." Australia's Collins-class submarines are aging. The first boats will need to be retired in the early 2030s, and even with life-of-type extensions, the entire class must be decommissioned by the late 2030s. If the Virginia-class purchases slip or the SSN-AUKUS program runs late — both common in submarine programs — Australia could face a period with fewer operational submarines than it needs. The gap between Collins retirement and new boat delivery is the program's most dangerous timeline risk.

U.S. industrial base constraints. The U.S. submarine industrial base is already struggling to build Virginia-class boats fast enough to meet the Navy's own requirements. Diverting 3-5 boats to Australia further strains a production line that is behind schedule. If U.S. political support for AUKUS weakens — due to budget pressures, a change in administration, or frustration with giving up submarines the Navy needs — the Virginia-class sales could be delayed or reduced.

Workforce development. Australia has zero experience operating nuclear submarine propulsion. Building the human capital — nuclear-qualified engineers, reactor technicians, submarine operators, and maintenance specialists — takes a decade or more. Australia has begun sending personnel to the U.S. Naval Nuclear Power Training Command, but scaling this pipeline to support an entire fleet is an unprecedented challenge for a country with no nuclear power industry.

Non-proliferation concerns. AUKUS involves transferring nuclear propulsion technology — weapons-grade highly enriched uranium (HEU) fuel — to a non-nuclear-weapons state. Australia has committed not to develop nuclear weapons and has accepted enhanced IAEA safeguards, but the precedent concerns some non-proliferation advocates. If other nations use AUKUS as a model to justify their own nuclear submarine programs, the broader implications for the non-proliferation regime could be significant.

The $368 billion price tag will be debated for decades. The submarines won't all be delivered until the 2060s. The technical, political, and industrial challenges are immense. But if Australia successfully builds and operates a fleet of nuclear-powered attack submarines, it will possess a capability that only six nations in the world currently maintain — and it will have fundamentally reshaped the strategic balance in the Indo-Pacific. For $368 billion, that's what Australia actually gets.