Beatrice Lang
Australia's decision to opt for diesel-electric submarines was influenced by various strategic, political, and economic factors. The country's unique operating environment, including significant variations in ocean climate and conditions, required submarines with long-range and endurance capabilities. Diesel-electric submarines, such as the Collins-class submarines, were specifically designed to meet these Australian conditions. Additionally, the ability to construct the submarines locally, technology transfer, and compatibility with US combat systems were also considered. Australia's willingness to pay a premium for diesel-electric submarines can be attributed to their desire for nuclear propulsion, which was not politically feasible at the time. The chosen design, the French Barracuda, offered the flexibility of retrofitting to nuclear propulsion in the future.
| Characteristics | Values |
|---|---|
| Cost | Diesel-electric submarines are typically cheaper than nuclear-powered versions, allowing countries to purchase a larger number. |
| Political landscape | Nuclear propulsion was not politically palatable at the time, but the Barracuda design could be retrofitted with nuclear propulsion in the future. |
| Ties with Japan | Japan and Australia have growing ties, especially regarding national security interests. |
| Size | The Soryu submarine was the right size, and there was existing synergy between Japan and Australia in submarine operations and development. |
| Industrial offsets | Dramatic industrial offsets were possible with the French design. |
| Local construction | The French design could be constructed locally in Australia. |
| Technology transfer | The French contractor could work with US combat systems suppliers. |
| Superiority | Nuclear submarines are tactically superior to diesel-electric submarines. |
| Range | Nuclear submarines have a longer range than diesel-electric submarines, which is important for Australia as its submarines have to transit long distances to reach patrol areas. |
| Stealth | Diesel-electric submarines are quieter and harder to detect than nuclear submarines. |
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What You'll Learn
Diesel-electric subs are quieter
Australia's decision to procure diesel-electric submarines stems from various strategic, financial, and technological considerations. One of the key advantages of diesel-electric submarines over nuclear-powered ones is their cost-effectiveness, allowing for the purchase of a larger fleet. This was a significant factor in Australia's choice, as they sought to acquire 12 advanced submarines.
Diesel-electric submarines also offer enhanced stealth capabilities, which are crucial for military operations. When operating on batteries, AIP-equipped (Air Independent Propulsion) diesel-electric submarines are almost silent, with minimal noise emanating from the shaft bearings, propeller, and hull. In contrast, nuclear submarines require large reduction gears and robust cooling systems, resulting in additional noise from pumps circulating cooling water.
The size and overall capability of the submarines were also important factors in Australia's decision. Diesel-electric submarines are typically smaller and more regionally focused, aligning with Australia's operational requirements in the Australasian region. Additionally, the ability to construct the submarines locally and work with US combat systems suppliers was advantageous.
While nuclear-powered submarines offer nearly unlimited endurance due to their nuclear reactors, diesel-electric submarines have improved their range and endurance with advancements in battery technology. This makes them well-suited for coastal defense, antisubmarine warfare, and regional deployments.
It is worth noting that diesel-electric submarines are not silent in both diesel and electric modes. They are only quiet when operating in electric-only mode while submerged. When recharging their batteries, diesel-electric submarines must snorkel, making them visible. However, advancements in AIP technology have reduced their dependence on snorkeling, enhancing their stealth capabilities.
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They are cheaper than nuclear-powered subs
Australia's decision to opt for diesel-electric submarines over nuclear-powered ones can be attributed to various factors, including cost considerations. Diesel-electric submarines are generally more affordable than their nuclear counterparts, allowing countries to purchase a larger number of vessels. For instance, Japan's Taigei-class diesel-electric submarines cost $639 million per unit, while Germany's Type 212 submarines have a price tag of $1.3 billion each. In contrast, the US's Virginia-class nuclear-powered submarines are significantly more expensive, ranging from $2.8 to $3.4 billion per unit.
The Collins-class submarine replacement program, also known as SEA1000, aimed to acquire 12 advanced diesel-electric submarines with air-independent propulsion (AIP) and quiet-running technologies. The program's total cost was estimated at just under $40 billion, which includes not just the submarines themselves but also research and development, integration of combat systems, and the establishment of local production and support infrastructure.
The higher cost of nuclear-powered submarines can be attributed to the complexity of their technology and the need for specialized infrastructure and fuel. Nuclear propulsion systems are more sophisticated and technically challenging to develop and maintain, contributing to their higher price tag. Additionally, nuclear-powered submarines require nuclear fuel, which can be a significant expense, especially if a country lacks an established nuclear industry.
In contrast, diesel-electric submarines have a more straightforward propulsion system that relies on diesel fuel. While diesel fuel storage sites can be vulnerable targets, as seen in the attack on Pearl Harbor, the overall cost of operating and maintaining diesel-electric submarines is typically lower.
It is worth noting that Australia's decision to choose French-designed diesel-electric submarines, specifically the Shortfin Barracuda, was influenced by the vessel's adaptability. The Barracuda was based on a nuclear attack submarine design and could be retrofitted with nuclear propulsion in the future if political landscapes changed. This option provided Australia with the flexibility to potentially transition to nuclear propulsion without committing to it initially.
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They can be built locally
Australia's decision to opt for diesel-electric submarines over nuclear-powered ones can be attributed to several factors, including the ability to construct the vessels locally.
The Collins-class submarines, which were the first submarines built in Australia, demonstrated the country's capability to construct and maintain these vessels locally. This not only provided a sovereign sustainment and maintenance capability but also spurred widespread improvements in Australian industry.
The ability to construct the submarines locally was a key consideration in the selection process. The Australian government required that appropriate infrastructure be established in Australia to construct the submarines and provide maintenance and technical support throughout their operational lifespan. This requirement ensured that the submarines would be tailored to Australian operating conditions and promoted long service life.
Additionally, constructing the submarines locally offered the advantage of technology transfer, allowing Australia to develop its own capabilities and reduce dependence on foreign suppliers. This aspect was particularly important given the lack of a local nuclear industry in Australia, which would have posed challenges in refuelling nuclear-powered submarines.
By opting for diesel-electric submarines, Australia could leverage the expertise of foreign designers while also ensuring that construction and maintenance could be largely handled within the country. This hybrid approach provided a balance between acquiring advanced technology and maintaining local involvement in the submarine program.
Furthermore, the decision to construct the submarines locally contributed to job creation and the development of specialized skills within the Australian workforce, fostering a sense of national pride and ownership in the project.
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They can be retrofitted with nuclear propulsion
Australia's decision to opt for diesel-electric submarines over nuclear-powered ones was influenced by various factors, including political considerations and cost. While nuclear propulsion offers significant performance advantages, such as unlimited range and high-speed operations, diesel-electric submarines have their benefits.
One of the primary reasons Australia chose to pursue diesel-electric submarines was the ability to retrofit them with nuclear propulsion in the future. The French Barracuda submarine, which was selected by Australia, is based on a nuclear attack submarine design. This design choice allows for the potential conversion to nuclear propulsion when the political landscape becomes more favourable.
The Barracuda's adaptability is a strategic decision by Australia to keep its options open. By selecting a design that can accommodate different propulsion systems, Australia gains flexibility in its submarine capabilities. This flexibility ensures that the submarines can be utilised effectively, regardless of the political constraints surrounding nuclear propulsion at any given time.
Additionally, the diesel-electric option may have been more feasible for Australia due to the absence of a local nuclear industry. Without the infrastructure to support nuclear fuel replacement, Australia would have been dependent on France for refuelling, which occurs approximately every ten years. This dependency could have been a significant factor in their decision to opt for diesel-electric submarines, at least initially.
The diesel-electric submarines selected by Australia are highly advanced, each equipped with air independent propulsion (AIP) and quiet-running technologies. These features enhance the submarines' stealth capabilities, making them harder to detect than nuclear submarines. While nuclear propulsion offers extended submergence times and superior speed and range, diesel-electric submarines have improved in performance and can be more versatile, especially in littoral waters and coastal operations.
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They are better for short-term missions
Australia's decision to opt for diesel-electric submarines was influenced by various strategic, tactical, and financial considerations. One of the key advantages of diesel-electric submarines is their suitability for short-term missions and border defence. Here are several reasons why:
Firstly, diesel-electric submarines are highly adaptable and can operate in diverse geographic and oceanographic conditions, making them well-suited for Australia's unique environment. They can navigate the long distances from HMAS Stirling to their deployment areas, and they are equipped to handle significant variations in temperature, salinity, density, and climate. This versatility enhances their effectiveness in short-term missions, where adaptability and responsiveness are crucial.
Secondly, diesel-electric submarines offer a more cost-effective solution compared to nuclear-powered alternatives. The lower cost allows Australia to acquire a larger number of submarines, which can be strategically positioned to cover a wider area. This increased presence can enhance border defence and improve response capabilities during short-term missions.
Additionally, diesel-electric submarines have improved stealth capabilities due to their quieter air-independent engines. This stealth advantage is particularly valuable for short-term missions, where maintaining a low profile and surprise can be decisive factors in achieving mission success.
The decision to choose diesel-electric submarines also considered the ability to construct the boats locally and the potential for technology transfer. Australia's partnership with France and other countries contributed to the development of a nuclear submarine design adapted for diesel-electric propulsion, which could be built and maintained locally. This collaboration provided Australia with greater control over its defence capabilities and ensured the timely availability of resources for short-term missions.
Moreover, the choice of diesel-electric submarines addressed concerns related to operational sovereignty. By opting for diesel-electric propulsion, Australia avoided becoming dependent on another country for nuclear fuel and technical support. This independence is particularly significant for short-term missions, where timely decision-making and autonomous deployment are essential.
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Frequently asked questions
Diesel-electric submarines are typically much cheaper than nuclear-powered submarines, so countries can buy more of them.
The French Barracuda submarine was based on a nuclear attack submarine design and could be retrofitted with nuclear propulsion when the political climate changed.
Australia wanted to keep its options open. Without a local nuclear industry, they wouldn't have been able to replace the fuel themselves every ten years and would have been dependent on France.
Australia wanted a submarine with a long range and endurance. Nuclear submarines give them that capability in a way that diesel-electric submarines cannot.
Australian submarines have to transit long distances to reach their potential patrol areas.
