Subco’s APX Cable: A Strategic Asset for Australia’s Digital Future
Summary Bullets:
• SubCo will establish a trans-pacific submarine cable project dubbed ‘APX East’ that will directly connect Australia with mainland US.
• While Australia already has sovereign owned cables, it’s crucial that this type of infrastructure remains in domestic ownership to ensure data sovereignty is met.
Over the last few years, international connectivity strategies have largely been driven by scale – favoring bigger pipes, alternative routes, and the assumption that capacity would keep pace with demand. However, with the rise in data traffic contributed by AI, data-intensive workloads, and diminishing tolerance for outages, this is forcing carriers to rethink how international networks are designed and evaluated.
In that context, submarine network developer and operator SubCo, based in Australia, announced that it would build the APX East cable, directly linking Australia to the US by 2028. This can be viewed as a significant step forward in strengthening Australia’s national telecommunications resilience. As data continues to become a core and strategic national asset, a sovereign-owned international cable offers Australia greater control over how its critical information is transmitted, secured, and governed – reducing reliance on foreign-controlled infrastructure at a time of rising geopolitical and cyber risk. While this project is a commercial infrastructure, it will also be a nation-building digital backbone. Given cables are tied to national security and strategic importance, the Australian government should take steps to encourage local investments and ensure ownership for securing Australia’s digital future.
SubCo plans to establish a direct trans-pacific optical link connecting Sydney (Australia) to San Diego, California (US) using a 16 fiber-pair design with no intermediate landings. The system is expected to cost $500 million (AUD747 million). At an estimated length of 12,000 to 13,000 km (7,500 to 8,075 miles), the cable is expected to be the longest continuous subsea optical route in the world. The project is intended to support the rapid growth of AI infrastructure in Australia, where hyperscalers and emerging neocloud providers are expected to deploy up to 3GW of AI ”factories” in the coming years. This cable will complement the company’s existing Oman Australia Cable (OAC) connecting Perth (Australia) to Muscat (Oman), which was launched in late-2022. It is worth noting that both Vocus and Telstra (including Endeavour to Hawaii) have already built their own cables, which demonstrates that private businesses are ready to invest in the country’s digital backbone. As the importance of this infrastructure grows, ensuring continued domestic ownership of future investments is critical.
As highlighted in GlobalData’s recent subsea cable report (AI Growth Collides with Infrastructure Limits, December 19, 2025), governments are increasingly intervening in the development and operation of cable systems due to digital sovereignty concerns. These concerns directly affect government services, defense, healthcare, and other critical industries. As a result, it’s becoming increasingly important that Australia exercises greater control over how sensitive data is routed and protected, reducing exposure to foreign jurisdictions, commercial priorities, and strategic interests of foreign-owned hyperscalers. In an era of heightened cyber risk and geopolitical uncertainty, ownership and control of digital pathways are as important as capacity.
Governments already co-invest in critical infrastructure such as roads, power, ports, and defense assets. Subsea cables should now be recognized with the same category. The government could show support in various ways from co-investment, underwriting – it could even have long-term capacity commitments. The goal is not to remove private capital; rather, targeted public participation can help ensure that national security, resilience, and data sovereignty are met. As the window narrows for Australia to shape its digital future, projects like APX East will determine who controls the arteries of the nation’s digital economy.










