The 35-year figure regarding no nuclear weapons deployment in the Indo-Pacific mentioned by diplomatic officials is merely a political smokescreen. From a weapons expert's perspective, what catches technical analysts' attention is the return of a Cold War-era strategic retaliation technology: Submarine-Launched Cruise Missiles (SLCM-N).
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| U.S. Navy personnel load UGM-84 Harpoon anti-ship missiles onto the Los Angeles-class fast-attack submarine USS Chicago (SSN 721) at Joint Base Pearl Harbor-Hickam, Hawaii, on July 28, 2021, in preparation for Large-Scale Exercise 2021 (LSE 2021). |
Developed to be reintegrated into the U.S. Navy’s Virginia-class attack submarines (SSN) in the 2030s, SLCM-N represents a shift from strategic nuclear deterrence to tactical medium-range deterrence. Unlike the Ohio-class or Columbia-class ballistic missile submarines carrying W76/W88 warheads on Trident II D5 missiles that are dedicated to hiding in deep seas, the Virginia-class attack submarines are optimized for multi-mission capability: from anti-submarine warfare, to minelaying, to cruise missile launches, and even inshore penetration.
The structure of this attack system relies on a primary delivery platform of Virginia-class nuclear attack submarines of the Block IV and Block V variants, equipped with VPM modules or 12 VLS vertical launch tubes. The lethal force of the system resides in the W80-4 tactical warhead variant attached to long-range cruise missile variants, with a variable explosive yield ranging from 5 to 150 kilotons, or approximately 0.3 to 10 times the yield of the bomb dropped on Hiroshima.
The effective range of this weapon exceeds 2,500 km, flying at a high subsonic speed of Mach 0.7 to 0.8 hugging the terrain with an extremely small radar cross-section (RCS). The underwater stealth principle allows the submarine to launch without needing to surface; instead, the missile is expelled from the launch tube using compressed gas in a specialized capsule before automatically activating the solid-propellant rocket motor as it breaches the surface to open its wings for flight.
Expected at the end of 2027, the nuclear submarine USS Colorado (SSN-788) — a Block III Virginia-class boat integrating composite-structured solid-sonar dome technology (LAB) — will be the first spearhead of the Submarine Rotational Force – West (SRF-W) to arrive at HMAS Stirling naval base on Garden Island, south of Perth. The energy heart powering this war machine is the S9G pressurized water reactor designed by General Electric, in which the letter 'S' stands for Submarine, '9' indicates the ninth generation, and 'G' represents the manufacturer.
This reactor generates approximately 210 Megawatts of thermal power, providing a shaft output of 40,000 horsepower, equivalent to 30 Megawatts. The fuel cycle of the reactor uses high-enriched Uranium cores at around 93%, allowing continuous operation for 33 years without cutting the hull for mid-life refueling, thereby completely eliminating complex maintenance risks at Australian infrastructure.
To suppress noise underwater, instead of using traditional propellers that readily cause cavitation — generating air bubbles that explode under high pressure causing devastating acoustic noise — the Virginia class adopts Pump-jet Propulsion technology. This structure consists of a stationary stator duct surrounding a multi-bladed rotor inside, helping to suppress acoustic vibration noise below a 90-decibel threshold, equivalent to the noise in a silent library.
Consequently, the boat can glide at underwater speeds exceeding 25 knots (46 km/h) while remaining completely invisible to any passive acoustic arrays of the adversary. Furthermore, from the Block V generations onwards, the U.S. Navy has inserted an additional 25-meter hull segment called the VPM (Virginia Payload Module), increasing the capacity of the large 2.2-meter launch tubes from 12 to 40 missiles, transforming a fast attack submarine into a heavy-hitting deterrence fortress.
The maintenance and operation of these nuclear machines at HMAS Stirling require the strictest technical standards of the defense engineering industry. In the initial phase, specialized technical tender ships like the supply ship USS Emory S. Land (AS-39) must be stationed at the port, carrying floating machine shops, heavy-duty cranes to lift missiles into VLS launch tubes, and electronic diagnostic systems for radar and sonar microchips. The base must also establish a high-frequency clean power supply combined with a pure cooling water network to dissipate heat for the reactor's secondary auxiliary loops when the submarine disconnects its main propulsion to standby mode, and maintain a safe collection process for low-level radioactive waste (LLW) from the primary cooling system.
Looking at it from a purely technical standpoint, there is significant confusion in the public between the concept of nuclear propulsion and nuclear weapons. Physically, a nuclear-powered Virginia-class submarine can entirely carry only conventional missiles such as Tomahawk Block V conventional unitary warhead (1,000 lb), Mk 48 ADCAP heavy torpedoes, or Quickstrike smart mines without violating non-proliferation treaties.
However, the United States' persistent adherence to the policy of Neither Confirm Nor Deny (NCND) the presence of nuclear weapons on deployment platforms has created a perfect tactical smokescreen, forcing the adversary to always calculate the worst-case scenario that the Virginia-class boats docked at Australia's west coast are trực chiến (actively deployed) with heavy tactical warheads. This presence is therefore not merely a social visit, but the positioning of peak hydrodynamic and acoustic technology infrastructure, officially reshaping the entire strategic chessboard in the Indo-Pacific region.
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