Virginia-class submarine (Australian acquisition)

The Virginia-class submarine is a US nuclear-powered attack submarine (SSN) that Australia will acquire under Phase 2 of the AUKUS Pillar 1 Optimal Pathway. The Virginia-class acquisition represents a historic milestone—Australia will become only the second country (after the UK under the 1958 US-UK Mutual Defense Agreement) to operate US nuclear-powered submarines.

Key aspects of the Virginia-class Australian acquisition:

1. Acquisition plan:

• Three Block IV Virginia-class SSNs to be transferred from the US to Australia
• Delivery sequencing: Approximately 2032, 2035, and 2038 (revised May 2026 from earlier estimates)
• Option for up to two additional Virginia-class submarines if the SSN-AUKUS program experiences delays
• The submarines will be transferred from the US Navy's inventory, with the US increasing Virginia-class production to maintain its own fleet while supporting the Australian transfer

2. Virginia-class specifications:

• Type: Nuclear-powered attack submarine (SSN)
• Builder: General Dynamics Electric Boat (prime) and Huntington Ingalls Industries (Newport News)
• Displacement: Approximately 7,900 tons submerged
• Length: Approximately 377 feet (115 meters)
• Propulsion: S9G nuclear reactor (GE Nuclear)
• Speed: 25+ knots submerged (classified)
• Weapons: 12 Tomahawk Land Attack Missile vertical launch tubes, 4 torpedo tubes for Mk-48 ADCAP torpedoes
• Sensors: Advanced sonar suites including bow-mounted sphere array, towed array, and flank arrays
• Crew: Approximately 135 personnel

3. Block IV characteristics:

• Block IV is the current production variant of the Virginia-class
• Block IV includes design improvements to reduce maintenance requirements and increase operational availability
• The Virginia Payload Module (VPM) on some Block IV boats adds 4 additional large-diameter payload tubes, each capable of holding 7 Tomahawk missiles (28 additional missiles)
• Block IV incorporates improvements in sensors, communications, and quieting technology

4. Strategic significance for Australia:

• The Virginia-class acquisition provides Australia with near-term SSN capability, bridging the gap between the Collins-class retirement and the SSN-AUKUS delivery
• Nuclear-powered submarines provide virtually unlimited range and endurance, enabling sustained operations throughout the Indo-Pacific
• The stealth and sensors of the Virginia-class provide intelligence collection, anti-submarine warfare, anti-surface warfare, and land strike capabilities
• The Tomahawk missile capability provides long-range precision strike, a new capability for the RAN
• The Virginia-class enables Australia to contribute to allied submarine operations at a higher level

5. Transition from Collins-class:

• The Virginia-class will replace Australia's current Collins-class diesel-electric submarines
• The Collins-class, while capable, has limited range and endurance compared to nuclear submarines
• The transition from diesel-electric to nuclear-powered submarines represents a fundamental transformation of the RAN's submarine capability
• The Collins-class life extension program ensures capability is maintained until Virginia-class delivery

6. US industrial base considerations:

• The Virginia-class transfer depends on US submarine industrial base capacity
• The US Navy is currently producing Virginia-class at a rate of approximately 1.5-2 boats per year
• The US has committed to increasing production to support both US and Australian needs
• The US submarine industrial base has faced challenges including workforce shortages and supply chain issues
• The AUKUS framework includes measures to strengthen the US submarine industrial base

7. Training and regulatory framework:

• Australian naval personnel will train at US nuclear propulsion facilities
• The Australian Naval Nuclear Power Safety Bill establishes the regulatory framework for nuclear submarine operations
• ANSTO provides nuclear stewardship expertise
• The transition involves significant workforce development including nuclear-trained crews, maintenance personnel, and regulatory staff

The Virginia-class acquisition represents a transformative upgrade to Australia's submarine capability. The transition from diesel-electric Collins-class to nuclear-powered Virginia-class SSNs will fundamentally change the RAN's ability to project power and contribute to allied operations in the Indo-Pacific. The acquisition also represents a historic deepening of the US-Australia alliance, with Australia becoming only the second nation trusted with US nuclear submarine technology.