Not yet designed. Not yet named. But already the most debated shipbuilding program in the U.S. Navy. SSN(X) will combine the speed of Seawolf, the stealth of Virginia, and the endurance of Columbia — for a future no one can fully predict.
The Virginia class is America's current fast attack backbone — but it was designed in the 1990s for a threat environment that no longer exists.
The Virginia-class submarine (SSN-774 series) is, by any measure, an outstanding warship. Since the commissioning of USS Virginia in 2004, the class has demonstrated exceptional combat capability, adaptability, and operational availability. With more than 40 boats commissioned or under construction across Blocks I through VI, Virginia is the largest and most capable nuclear attack submarine production program in U.S. history.
But the Virginia class was designed in the 1990s. Its acoustic quieting technology, sensor systems, and speed envelope reflect the threat environment that existed when the requirements were written — before the modern Chinese Navy had developed its current generation of nuclear submarines, and before Russian submarine technology had recovered from the post-Cold War decay of the 1990s.
By the 2030s and 2040s, when the first SSN(X) boats would enter service, the threat environment will be fundamentally different. China's PLA Navy is currently deploying a new generation of nuclear attack submarines that are significantly quieter than their predecessors. Russia continues developing and deploying advanced multi-mission submarines. Both nations are investing heavily in Anti-Submarine Warfare (ASW) sensors, processing systems, and unmanned platforms that could challenge the acoustic advantage that U.S. submarines have long enjoyed.
The Virginia class, however capable today, was not designed to maintain dominance in this projected future threat environment. SSN(X) is the Navy's answer to that long-term challenge.
The requirement that drives SSN(X) is essentially a demand for multi-dimensional superiority: a submarine that is simultaneously faster, more heavily armed, acoustically quieter, more capable of integrating with unmanned systems, and more suitable for extended patrols in the vast Pacific theater than the Virginia class it will eventually replace.
The speed requirement is perhaps the most technically demanding. The Virginia class can achieve approximately 25 knots submerged, but it must slow dramatically — to something closer to 5–8 knots — to maintain its acoustic quieting advantage. A submarine running fast is a submarine that can be heard. The Navy wants SSN(X) to approach the speed of the Seawolf class (estimated at 35+ knots) while maintaining operational stealth at high transit speeds. Achieving this requires a more powerful reactor, a quieter propulsion train, and advances in hull-borne noise reduction that represent a genuine engineering challenge.
The payload requirement reflects hard lessons from the Pacific theater. The distances involved in operating against Chinese or Russian naval forces in the Western Pacific require submarines with more weapons, more range, and more endurance than Virginia offers in its current configuration — even with the Virginia Payload Module (VPM) that added 4 large-diameter payload tubes to Block V boats. SSN(X) is being designed from the outset with a larger payload capacity, with an emphasis on integrating with unmanned underwater vehicles (UUVs) that can extend its sensing and strike reach without requiring the mother submarine to take risks a crew cannot afford.
The connection to USS Albuquerque and her Los Angeles class is generational: every generation of U.S. submarine has been designed to defeat a threat that did not fully exist when the design began. SSN(X) follows that tradition into the 2040s.
Navy officials have described SSN(X) using a clear conceptual framework: it will draw the best attributes from three existing classes and combine them in a single next-generation hull.
The three Seawolf-class submarines (USS Seawolf, Connecticut, Jimmy Carter) remain the fastest and most heavily armed U.S. attack submarines ever built. At an estimated 35+ knots submerged with a weapons capacity of 50+ weapons, Seawolf was designed to dominate Soviet deep-water submarines in the cold, dense waters of the North Atlantic. SSN(X) seeks to recover this speed advantage — which was traded away in the Virginia class in exchange for quieting and cost — and pair it with a modern acoustic signature. The Seawolf's massive weapons payload capacity is also a target attribute: SSN(X) should be able to carry significantly more weapons than Virginia's standard loadout.
The Virginia class represents the current state of the art in U.S. submarine acoustic quieting technology. Its anechoic coating systems, isolated machinery mounts, advanced hull-borne noise reduction, and low-turbulence propulsor design make it among the quietest submarines in the world at slow speeds. SSN(X) must maintain and improve on this quieting baseline — particularly at the higher speeds that are now a primary requirement. Virginia also demonstrated the value of modular design: the Virginia Payload Module was retrofitted into Block V boats with limited disruption. SSN(X) will extend this modularity philosophy from the beginning, enabling upgrades and payload customization across a long service life.
The defining innovation of the Columbia-class SSBN is its life-of-ship reactor — a nuclear plant that requires no refueling for the submarine's entire 42-year service life. The Navy is pursuing a similar philosophy for SSN(X): a next-generation reactor that maximizes operational availability, minimizes shipyard time, and provides the power density needed for the boat's high-speed requirements. The Columbia program has also demonstrated advanced turbo-electric propulsion that SSN(X) may adapt for its own power train. Extended patrol endurance is directly linked to the Pacific theater requirement: a submarine that can operate in theater for longer periods provides more tactical value than one requiring frequent transit to and from bases.
The attributes SSN(X) seeks from these three classes are not naturally compatible. Seawolf's speed came partly from its massive size (9,137 tons submerged) and powerful S6W reactor — both at the cost of acoustic signature at speed. Virginia's extraordinary quieting was achieved partly by accepting speed limitations. Columbia's life-of-ship reactor works partly because it powers a slower submarine with a deterministic deterrence mission rather than the dynamic sprint-and-creep profile of an attack boat. Combining genuine 35-knot speed with Seawolf-class payload and Virginia-class quieting in a single hull is an engineering challenge without clear precedent. The $622.8 million in FY2026 R&D spending reflects the difficulty of that challenge.
SSN(X) has already been delayed by five years before a single boat has been laid down. Understanding the timeline — and the reasons for the delay — is essential context for evaluating the program.
"The delay of SSN(X) construction start from the mid-2030s to the early 2040s presents a significant challenge to the submarine design industrial base associated with the extended gap between the Columbia class and SSN(X) design programs."
— U.S. Navy FY2025 Shipbuilding PlanThe first Virginia-class submarine is ordered — beginning the 21st-century attack submarine lineage that SSN(X) will eventually succeed. Planning for a future follow-on class is conceptual at this stage; the immediate priority is getting Virginia into production at an affordable price to replace the aging Los Angeles-class fleet that included USS Albuquerque and her sisters.
The Navy formally begins developing requirements for a next-generation fast attack submarine to follow the Virginia class. Key attributes — speed, payload, acoustic quieting, UUV integration, AI-assisted combat management — are established. The program is designated SSN(X), with the X indicating an undefined future design rather than a specific hull design. Initial concept studies examine what combination of attributes can be achieved within a constrained budget environment.
The Navy's FY2025 budget submission defers the first SSN(X) procurement from the previously planned FY2035 to FY2040 — a five-year delay. The stated reason is budget constraint: the Columbia-class SSBN program is consuming enormous resources, the Virginia production line faces its own cost pressures, and overall Navy shipbuilding funding cannot support all three programs simultaneously at their original timelines. The deferral saves near-term procurement dollars but extends the gap between current Virginia production and SSN(X) introduction.
5-Year DelayThe FY2026 budget request includes $622.8 million in R&D funding for SSN(X)-related development across two program elements: $366.0 million for SSN(X) Class Submarine Development (PE 0604850N), covering concept design work, requirements refinement, and technology maturation; and $256.8 million for Next Generation Fast Attack Nuclear Propulsion Development (PE 0603570N), covering the advanced reactor that will power SSN(X). This sustained investment maintains momentum in the design and technology base despite the procurement deferral.
Active R&D FundingWith Columbia class design work completing and Virginia class production maturing into a steady rhythm, the engineering workforce at Electric Boat and Newport News can transition increasing effort toward SSN(X) detailed design. The Navy's concern about the "design gap" — the period between completing Columbia design work and beginning SSN(X) design — is that submarine design expertise is highly specialized and difficult to rebuild once it disperses. Maintaining continuity of design teams through sustained R&D investment is the primary mitigation strategy.
PlannedThrough the 2030s, the Virginia class remains the primary production focus for both Electric Boat and Newport News. The current goal is 2 boats per year — a rate that is not yet being consistently achieved (actual delivery rate is approximately 1.1–1.2 boats per year as of 2025). Achieving the 2/year goal is a prerequisite for meeting fleet size requirements through the gap before SSN(X) enters production. AUKUS obligations to deliver 3–5 Virginia-class boats to Australia's Royal Australian Navy in this period add further demand on an already strained production system.
Under the current deferred timeline, the first SSN(X) would be procured in approximately FY2040 — and would not be commissioned and operational until the mid-2040s at the earliest, given typical design-to-commission timelines. The Navy plans to procure SSN(X) at a rate of 2 boats per year from roughly FY2034 to FY2049 (33 boats total), with the planned production rate dependent on resolving the shipyard capacity challenges that affect the entire U.S. nuclear submarine program.
Current Revised PlanSSN(X) has no final design — all figures are projections or goals. But comparing what is known against existing classes gives a clear picture of the ambition behind the program.
| Attribute | Virginia Block V | SSN(X) Projected | Seawolf Class | Los Angeles (SSN-706) |
|---|---|---|---|---|
| Displacement | ~10,200 tons submerged | ~10,100 tons (est.) | 9,137 tons | 6,927 tons |
| Length | ~461 ft (140.5 m) | TBD (~500 ft projected) | 353 ft (107.6 m) | 360 ft (109.7 m) |
| Speed (submerged) | 25+ knots | 35+ knots (goal) | ~35 knots | >25 knots |
| Weapons Capacity | 65+ (with VPM) | 50–80+ (projected) | 50 | ~26 (tube-loaded) |
| Torpedo Tubes | 4 × 533mm | 4+ × 533mm (TBD) | 8 × 660mm (26") | 4 × 533mm |
| Reactor | S9G (~40,000 SHP) | Next-gen HEU (classified) | S6W (~52,000 SHP) | S6G (~35,000 SHP) |
| UUV Integration | Limited / emerging | Yes — major design focus | USS Jimmy Carter (modified) | None |
| AI / ML Systems | Emerging upgrades | Integrated from design | None | None |
| Crew | ~135 | TBD (automation may reduce) | ~140 | ~127 |
| Unit Cost | >$5B current | $7.1–$8.7B (est.) | ~$3.4B (FY1997$) | ~$900M (FY1983$) |
| First Commissioned | 2004 | Mid-2040s (projected) | 1997 | 1976 |
Note on the displacement comparison: The projected ~10,100 ton displacement for SSN(X) is slightly less than Virginia Block V (~10,200 tons with VPM), which may seem counterintuitive for a larger, faster submarine. The figure is a preliminary planning estimate only and is likely to grow as the design matures — each generation of U.S. nuclear attack submarine has been larger than its predecessor as additional systems are integrated. Compare: Los Angeles at 6,927 tons → Seawolf at 9,137 tons → Virginia Block V at ~10,200 tons. SSN(X) will almost certainly exceed 10,100 tons when actual design requirements are translated into steel. The Congressional Budget Office and others have flagged this "optimism bias" in Navy displacement estimates.
One of the most consequential policy debates surrounding SSN(X) concerns a question most people never think about: what kind of nuclear fuel should power the reactor?
Every nuclear-powered submarine in the United States Navy — from USS Nautilus in 1954 to the Virginia-class boats being built today — uses Highly Enriched Uranium (HEU) as reactor fuel. HEU is uranium enriched to greater than 20% uranium-235 concentration; weapons-grade uranium is enriched to 90%+, while Navy reactor fuel uses approximately 93% enrichment. This extraordinary energy density is what allows a naval reactor to be small enough to fit in a submarine while delivering the power needed for high-speed operation — and, in the life-of-ship reactors developed for Columbia class, to run for decades without refueling.
The alternative — Low-Enriched Uranium (LEU), enriched to less than 20% U-235 — is the type of fuel used in commercial nuclear power plants and research reactors. LEU is less energetically dense than HEU, which means an LEU reactor must be larger to produce the same power output, or it produces less power in the same volume, or it requires more frequent refueling.
The nuclear nonproliferation argument for LEU is real: HEU can be weaponized more directly than LEU, which means that nations possessing HEU reactor technology — or receiving HEU-powered submarines — create proliferation risks that LEU-based systems do not. This concern is most acute in the AUKUS context, where the United States and United Kingdom are planning to provide nuclear-powered submarines to Australia, a non-nuclear-weapons state that has signed the Nuclear Non-Proliferation Treaty (NPT). The NPT framework does not clearly address HEU-powered naval vessels — a legal and diplomatic complexity being actively negotiated with the International Atomic Energy Agency (IAEA).
In May 2024, the U.S. Navy made its position unambiguous: SSN(X) will use HEU. The Navy's assessment is that the penalties of LEU — estimated development cost of $25 billion over 20–30 years, with success not guaranteed, and likely reduction in reactor endurance, submarine speed, and operational capability — are not justified by the proliferation benefits for a system that will remain in highly controlled U.S. Navy service. This decision effectively forecloses the LEU option for the primary U.S. attack submarine program while leaving AUKUS-specific design questions partly open.
Providing nuclear-powered submarines to Australia under AUKUS Pillar I represents a genuinely novel situation in international nuclear law. Australia is a non-nuclear-weapons state under the NPT and has no domestic HEU fuel cycle. The IAEA must approve any arrangement involving the transfer of HEU-powered military vessels — a safeguards framework that has never been applied before. The ongoing IAEA-U.S.-Australia-UK negotiations represent some of the most complex nuclear nonproliferation diplomacy since the NPT's creation in 1968. For more on AUKUS, see the Columbia Class page and the AUKUS section below.
The Navy and the Congressional Budget Office disagree by 23% on what SSN(X) will cost. That gap — $1.6 billion per boat — has enormous implications for the Navy's overall shipbuilding budget.
The Navy's official cost estimate for SSN(X) is $7.1 billion per boat in constant FY2024 dollars, based on the assumed ~10,100-ton displacement and planned systems architecture. This estimate drives the Navy's programming and budget planning and is the figure cited in official budget justifications. It assumes successful resolution of the technical challenges around high-speed quieting and next-generation propulsion, and it assumes the production efficiencies that come from a high-rate construction program.
The Congressional Budget Office's independent estimate for SSN(X) is $8.7 billion per boat — 23% higher than the Navy's figure. CBO's methodology adjusts for the historical pattern in which Navy cost estimates for new submarine classes have consistently proven optimistic. CBO notes that for the Virginia class, their early-program estimates were closer to actual outcomes than the Navy's; a similar pattern with SSN(X) would mean actual costs could approach or exceed CBO's $8.7 billion figure. At 33 boats, the CBO estimate implies a total program cost approaching $287 billion.
The 23% gap between Navy and CBO estimates is not unusual for early-stage major defense programs — it reflects genuine uncertainty about the cost of technologies and capabilities that have not yet been designed. The more relevant historical data point is CBO's track record: for the Virginia class, CBO's pre-production estimates proved more accurate than the Navy's, with Virginia costs ultimately settling closer to CBO's projections than the Navy's optimistic early figures.
At $8.7 billion per boat and 33 boats planned, the total SSN(X) program cost under CBO's estimate would be approximately $287 billion — making it potentially the most expensive military program in U.S. history, surpassing even the F-35 Joint Strike Fighter program's estimated $1.7 trillion lifetime cost (when extended to full life). This number generates intense Congressional attention and raises fundamental questions about affordability within the overall Navy budget.
The key cost driver, as with the Columbia class, is the reactor. Developing a next-generation HEU reactor that provides the power density required for 35+ knot operation while maintaining stealth and meeting the Navy's life-of-ship goals requires extraordinary engineering investment. The $256.8 million in FY2026 propulsion R&D alone reflects the scope of this challenge.
Congressional oversight has focused particularly on whether the SSN(X) requirements can be relaxed — whether, for example, a top speed of 30 knots (rather than 35) might produce a significantly more affordable submarine that still represents a major capability improvement over Virginia. The Navy has so far maintained that the full requirement set is necessary to address the projected threat environment of the 2040s and beyond, but this debate will continue as detailed design work begins to generate firmer cost estimates.
Only two shipyards in the United States can build nuclear submarines. Both are currently at or beyond their sustainable production capacity.
Nuclear submarine construction in the United States is a monopoly — a duopoly, technically, but with no realistic alternatives. General Dynamics Electric Boat in Groton, Connecticut (with a large fabrication facility at Quonset Point, Rhode Island) and HII Newport News Shipbuilding in Newport News, Virginia are the only yards with the facilities, tooling, workforce, and regulatory certifications to build nuclear-powered submarines. No other yard exists. No other yard could be stood up in any practical timeline. This industrial reality constrains everything else about the submarine program.
Both yards are currently operating at or near their maximum sustainable capacity. The Virginia-class goal of two boats per year has not been consistently achieved — the actual production rate in recent years has been approximately 1.1 to 1.2 boats per year across both yards. This shortfall reflects workforce challenges (submarine construction requires highly skilled welders, pipefitters, and nuclear systems specialists who take years to train), supply chain issues, and the sheer complexity of building nuclear submarines in a world where civilian manufacturing is not optimized for defense requirements.
Layered on top of the Virginia production challenge is the Columbia-class SSBN program: Electric Boat is building Columbia-class submarines at a rate of approximately one per year (eventually), while simultaneously building Virginia-class boats and maintaining the workforce and facilities required to support both programs. The Columbia class's size and complexity mean it consumes a disproportionate share of shipyard capacity relative to Virginia.
And then there is AUKUS: the United States has committed under AUKUS Pillar I to selling 3 to 5 Virginia-class submarines to Australia's Royal Australian Navy beginning in the approximately 2032–2038 timeframe. These boats represent additional demand on the same two shipyards — demand that must be met while Virginia production targets are already not being achieved, Columbia is consuming capacity, and SSN(X) design work begins requiring specialized engineering talent that overlaps with production demands.
The Navy acknowledges this tension explicitly. The 5-year delay to SSN(X)'s first procurement is partly a reflection of this industrial capacity reality: there is no practical scenario in which SSN(X) procurement could have begun in FY2035 given the production demands of Columbia and Virginia through the 2030s.
Lead yard for Columbia-class (SSBN-826 series) and primary Virginia-class production partner. Electric Boat has been building nuclear submarines since USS Nautilus in the 1950s and is the design and integration lead for both active programs. The Groton facility performs final assembly and outfitting for Columbia-class boats; Quonset Point fabricates hull sections and modules.
Current simultaneous programs: Columbia class (lead), Virginia class (joint production with Newport News). Future: SSN(X) design lead role expected. Design workforce is the most critical bottleneck — the engineers who designed the Columbia class represent irreplaceable expertise that must be retained and transitioned to SSN(X) without a damaging gap.
Partner yard for Virginia class and module fabrication partner for Columbia class. Newport News delivers bow sections and other major modules to Electric Boat for Columbia integration, while simultaneously building Virginia-class submarines. Newport News also builds nuclear-powered aircraft carriers (Ford class), competing for the same skilled nuclear construction workforce.
The carrier program and submarine program share workforce in ways that create scheduling tension: nuclear-rated construction workers who can weld on submarine pressure hulls are also qualified for carrier nuclear systems work. Managing these workforce demands while achieving the target Virginia production rate — and supporting AUKUS delivery commitments — is one of the most complex industrial challenges in current U.S. defense procurement.
Beyond production capacity, there is a subtler but equally serious concern: the submarine design workforce. The engineers and architects who design nuclear submarines — who translate requirements into detailed structural drawings, who specify reactor systems and propulsion arrangements, who work through the thousands of integration challenges that arise in a complex warship — are highly specialized professionals who take decades to develop. The Navy's explicit concern is that there will be a gap between the completion of major Columbia-class design work and the beginning of SSN(X) detailed design work during which these professionals will have nothing to do. In peacetime, companies do not retain expensive engineers on stand-by. They leave. They retire. They find other work. When they go, their knowledge goes with them. The $622.8 million in FY2026 R&D funding is the primary tool for preventing this from happening — keeping the design workforce engaged in SSN(X) preliminary work during the years when there is no immediate production program to support.
SSN(X) is a purely U.S. Navy program. AUKUS Pillar I is a parallel but separate effort — and understanding the distinction matters for understanding both programs.
The AUKUS security partnership announced in September 2021 between Australia, the United Kingdom, and the United States has two pillars. Pillar II covers a range of advanced technology cooperation areas including AI, quantum, cyber, and hypersonic capabilities. Pillar I — the one that generates the most attention — is specifically about providing Australia with conventionally-armed nuclear-powered submarines.
Australia currently operates Collins-class conventional (diesel-electric) submarines and has no experience with nuclear propulsion. Under AUKUS, Australia will acquire nuclear-powered attack submarines through a three-phase process that ultimately leads to a new jointly-developed design called SSN-AUKUS — a submarine that will be built in Australia (and the UK) and will serve in both the Royal Australian Navy and the Royal Navy.
SSN(X) and SSN-AUKUS are related but distinct programs. SSN-AUKUS will draw on U.S. technology, potentially including technology developed for SSN(X), but it is a separate design effort led by the UK's BAE Systems in partnership with Australia's ASC. SSN-AUKUS will be built to UK and Australian requirements, not U.S. Navy requirements, and will serve in allied navies — not the U.S. Navy.
The AUKUS framework creates both opportunities and complications for the U.S. submarine program. On the opportunity side: technology sharing with Australia and the UK across advanced submarine systems could yield innovations that benefit SSN(X). The UK's experience with its Astute-class and upcoming Dreadnought-class submarines, and Australia's investment in submarine technology, could accelerate U.S. development in certain areas.
On the complication side: the commitment to sell Virginia-class submarines to Australia in the 2032–2038 timeframe adds demand to an already strained industrial base. Each Virginia sold to Australia is a Virginia not available for the U.S. Navy during a period when the attack submarine fleet is already below desired strength. The Navy has committed to managing this through production rate increases — a commitment that requires both yards to solve their current production shortfalls. The HEU/LEU question also intersects with AUKUS: providing HEU-powered Virginia-class boats to Australia requires IAEA safeguards arrangements that are diplomatically complex, as discussed in the AUKUS section of the Columbia class page.
U.S. and UK nuclear submarines conduct rotational deployments to HMAS Stirling (Fleet Base West), Western Australia. Australian sailors begin training on U.S. and UK submarines, building the nuclear-qualified workforce Australia will need. No submarine transfers occur in this phase.
Sale of 3–5 Virginia-class submarines to the Royal Australian Navy. These boats give Australia operational nuclear submarine capability while SSN-AUKUS is developed and built. IAEA safeguards arrangements must be finalized before transfer can proceed. This phase strains U.S. production capacity most directly.
SSN-AUKUS — a new submarine design developed jointly by BAE Systems (UK) and ASC (Australia), incorporating U.S. technology — enters service in the Royal Navy and Royal Australian Navy. Larger than Virginia class. Draws on SSN(X) technology but is a separate design. Built in UK (Barrow-in-Furness) and Australia (Osborne, South Australia).
The Congressional Research Service's December 2025 report (CRS IF11826) identifies six primary areas of congressional concern regarding the SSN(X) program. Each represents a fundamental policy question with no easy answer.
The requirement for 35+ knots at full acoustic stealth is the most technically demanding — and most cost-driving — element of SSN(X)'s specification. Congress must evaluate whether this speed requirement is genuinely necessary to defeat the projected threat environment of the 2040s, or whether a more modest capability improvement over Virginia (say, 30 knots with better quieting) might achieve the strategic objective at substantially lower cost. The Navy's position is that the full requirement is necessary; independent analysts have questioned whether the tactical scenarios that demand 35+ knots of silent running are realistic. If the requirement were relaxed, cost estimates could fall significantly — potentially closing the gap between Navy and CBO projections.
If the Congressional Budget Office's estimate of $8.7 billion per boat is correct rather than the Navy's $7.1 billion, the 33-boat SSN(X) program would cost approximately $287 billion — $51 billion more than the Navy's projection. This additional cost must come from somewhere in the Navy's constrained shipbuilding budget. The Navy already cannot fund the Virginia class at the desired 2-per-year rate, cannot fully fund Columbia on schedule, and has committed AUKUS Virginia deliveries that strain production. Congress must determine whether the SSN(X) program is affordable at realistic cost levels, or whether requirements must be reduced, the program scaled back, or other Navy programs deferred to compensate.
The five-year delay in SSN(X)'s first procurement means that the transition from Virginia to SSN(X) in the active fleet will not begin until the late 2040s — nearly a decade later than originally planned. During this period, the Navy's attack submarine force will consist entirely of Virginia-class boats that were designed in the 1990s, while China and Russia continue to improve their own submarine forces. Congress must assess whether this gap represents an acceptable risk, or whether accelerated investment in Virginia-class upgrades (or a bridge capability) is needed to maintain undersea superiority during the delay period.
The submarine design industrial base is uniquely vulnerable to the gap between completing Columbia-class design work and beginning SSN(X) detailed design. Naval architects and nuclear engineers who design submarines are among the most specialized workers in any industry — and they are not kept on retainer. The Navy's strategy of sustained R&D investment ($622.8M in FY2026) is intended to maintain this workforce through the gap, but Congress must evaluate whether this investment level is sufficient, whether the design workforce will in fact remain intact, and what contingency plans exist if critical expertise is lost before SSN(X) design begins in earnest.
The Navy has confirmed that SSN(X) will use HEU. But Congress retains the authority to challenge this decision — and some members, motivated by nonproliferation concerns related to AUKUS, have raised questions about LEU development. The $25 billion estimated development cost and the 20–30 year timeline are deterrents; so is the Navy's credible assessment that LEU would reduce operational capability. But if AUKUS obligations eventually require LEU-powered vessels for Australia, and if that LEU development program were funded separately from SSN(X), the calculus might change. Congress must decide whether to accept the Navy's HEU decision or to mandate (and fund) an LEU development path in parallel — knowing that such a mandate would consume budget that might otherwise fund production.
The Virginia class is built jointly by Electric Boat and Newport News — each yard delivers complete submarines, and the program benefits from competition and redundancy. Earlier submarine classes (including Los Angeles boats like USS Albuquerque herself) were sometimes built at a single yard. Columbia is primarily an Electric Boat lead program. The right production model for SSN(X) — joint from the start, phased competition, or single yard — has significant implications for cost, schedule, and industrial base health. Congress must evaluate the production strategy as design work matures, ensuring that neither the drive for competition (which increases cost overhead) nor the preference for single-yard efficiency (which concentrates risk) prevents the program from achieving its production rate goals.