Australians are learning an uncomfortable lesson about maritime power. The conflict in the Middle East and threats to tanker traffic through the Strait of Hormuz have pushed oil prices sharply higher and exposed a deeper strategic vulnerability: Australia’s prosperity depends overwhelmingly on sea lanes it does little to secure.
For most Australians, the crisis appears simply as rising petrol prices. But what is unfolding is not just another commodity cycle. It is a reminder that control of maritime chokepoints and capacity points—and the ability to keep trade moving through them—remains a decisive factor in global politics.
Australia, a nation whose economy is built on seaborne trade, is discovering how quickly disruptions at sea can cascade through domestic life.
Tensions in the Persian Gulf have already pushed global oil prices above US$100 (about A$140) a barrel, with shipping insurers and tanker operators pricing risk into every voyage through contested waters. Analysts warn that petrol in Australia could rise by between 30 and 40 cents per litre as supply chains absorb the shock.
The effects spread quickly beyond the bowser. Diesel prices feed directly into electricity generation, freight, and agriculture. When transport costs rise, so do food prices and household bills. Strategic instability thousands of kilometres away is translated into everyday economic pressure.
This is the reality of maritime dependence.
More than 80 percent of global trade by volume travels by sea. Australia’s dependence is even greater: roughly 99 percent of the country’s trade moves by ship. The same oceans also carry the undersea cables that transmit nearly all international digital traffic.
Despite this reliance, Australia has often treated maritime security as someone else’s responsibility. For decades the global maritime order—largely underwritten by the United States and its partners—has ensured open sea lanes and predictable trade flows.
That arrangement has allowed Australia to focus on economic growth while assuming the sea would remain secure.
Strategists from Alfred Thayer Mahan onward have warned against this complacency. Sea power has always been more than just ships. The ability to protect shipping, maintain access to trade routes and prevent adversaries from controlling key chokepoints and capacity points is a foundation of national prosperity, not a peripheral concern.
Australia’s exposure is heightened by its dependence on imported fuels. Domestic refining capacity has declined, and national fuel reserves remain well below the International Energy Agency’s recommended 90-day benchmark. The country therefore relies on a constant flow of tankers operating on tightly synchronised supply chains.
In effect, Australia has bet its economic stability on uninterrupted maritime access.
Disruptions to shipping quickly ripple through the real economy. Reports from regional Australia already suggest fuel distributors have reduced allocations to transport operators and farmers as supply tightens. Agricultural groups warn that diesel shortages could disrupt planting and harvesting cycles, while freight companies face rising operating costs.
These pressures illustrate a basic strategic principle: when sea lanes become contested, the economic consequences are immediate. For a country as maritime-dependent as Australia, the implications are profound.
No middle power can secure the global commons alone. Maintaining open sea lanes requires coalitions of capable maritime states.
Australia has historically contributed to these efforts. Royal Australian Navy deployments to the Gulf and Indian Ocean have supported maritime security missions, sanctions enforcement and the protection of commercial shipping. Such deployments were not symbolic; they were part of the collective effort that keeps global trade moving.
Participation in similar operations today should therefore be seen not simply as alliance management but as a direct defence of Australia’s own economic lifelines.
Australia’s leaders often speak of defending a rules-based order. But that order ultimately depends on maritime power—ships, alliances and infrastructure—to keep sea lanes open and maintain the access that is vital to Australia.
The 2023 Defence Strategic Review and initiatives such as AUKUS acknowledge Australia’s growing exposure in an increasingly contested maritime Indo-Pacific. But recent events in the Middle East underline that maritime vulnerability is not confined to our region; it is a global structural risk for a sea-dependent economy.
If the current crisis tells us anything, it is that Australia cannot remain a passive beneficiary of maritime security. Protecting the sea lanes that sustain the nation must become a central priority of Australian strategy.
That access remains a core national interest.
