Key Takeaways
- Australian Defence Minister Richard Marles warned that the seabed is increasingly becoming a battlefield, citing repeated cuts to undersea internet cables attributed to China and Russia.
- The AUKUS partnership unveiled a new “signature project” to develop advanced uncrewed underwater vehicle (UUV) payloads for protecting undersea cables and maintaining maritime advantage.
- Australia will procure three second‑hand Virginia‑class submarines from the United States under AUKUS, simplifying supply chains and boosting cost efficiency.
- Marles stressed the vulnerability of Australia’s internet infrastructure, noting that ~99 % of its traffic relies on just 15 subsea cables.
- US Secretary of Defense Pete Hegseth reiterated the administration’s commitment to a “stable equilibrium” in the Indo‑Pacific, urging allies to increase defence spending while avoiding direct mention of Taiwan.
- Hegseth invoked Theodore Roosevelt’s “speak softly, but carry a big stick” doctrine and announced a record US defence budget request of US$1.5 trillion aimed at sustaining long‑term military dominance.
- Both Marles and Hegseth highlighted the broader threat posed by “shadow‑fleet” vessels—unregistered, flag‑of‑convenience ships used for sanctions evasion, illicit trade, and potential coercion.
Marles Describes the Seabed as a New Battleground
Speaking at the Shangri‑La Dialogue in Singapore, Australian Defence Minister Richard Marles declared that the seabed has become a battlefield. He warned that the growing use of so‑called “shadow‑fleet” vessels—ships operating in the grey zone between legitimate commerce and state coercion—poses a direct threat to critical undersea infrastructure. Marles emphasized that these vessels are not merely hypothetical dangers; they have already been implicated in a series of cable cuts that underscore the fragility of global communications.
Unprecedented Cable Cuts Highlight Vulnerability
Marles cited a documented pattern of attacks on subsea cables over the past 18 months, noting five incidents in the Taiwan Strait attributed to China and three in the Baltic Sea linked to Russia. Even if some of these cuts were accidental, they reveal the extreme vulnerability of the world’s undersea network. He asked whether such events are tests of national response times, attribution thresholds, and political will to react, urging nations to confront the issue honestly rather than dismiss it as speculation.
Australia’s Heavy Reliance on a Thin Cable Network
The minister pointed out that approximately 99 % of Australia’s internet traffic traverses just 15 subsea cables. This concentration makes the nation’s financial, health, communications, intelligence, and economic systems acutely exposed. Marles likened these cables to the “arteries of modern civilisation,” stressing that a single anchor drag in the middle of the night could sever vital services and cripple a modern state’s ability to function.
AUKUS Launches Underwater Drone Signature Project
In response to the growing threat, US Secretary of Defense Pete Hegseth announced the first “signature project” under the second pillar of the AUKUS treaty. The initiative will deliver a suite of highly adaptable multi‑mission uncrewed underwater vehicle (UUV) payloads designed to support undersea operations and preserve the alliance’s maritime edge. UK Defence Secretary John Healey added that the technology—featuring cutting‑edge sensors and weapons systems—will rapidly equip forces with the most advanced battlefield capabilities for underwater domains.
Australia Secures Second‑Hand Virginia‑Class Submarines
Alongside the UUV project, the AUKUS announcement revealed that Australia will acquire three second‑hand Virginia‑class submarines from the United States, rather than a mix of older and newer vessels. This decision aims to streamline supply‑chain management, simplify operational and maintenance requirements, and maximise cost efficiencies. By standardising the submarine fleet, Australia hopes to enhance interoperability with its AUKUS partners while reducing logistical complexity.
Marles Calls for Greater Transparency from Beijing
Marles urged China to seize a “real opportunity” to contribute to regional stability by being more transparent about its maritime operations. He argued that openness would support the peaceful order upon which China’s own prosperity depends, counteracting existing patterns of grey‑zone activity that undermine a stable Asia‑Pacific. The minister warned that continued opaque behaviour risks eroding trust and could provoke broader confrontation.
Shadow‑Fleet Vessels Pose Multifaceted Threats
Beyond cable sabotage, Marles highlighted that shadow‑fleet networks serve as conduits for sanctions evasion, transport of energy that fuels Russia’s war in Europe, illegal fishing, and human and drug trafficking. These unregistered, flag‑of‑convenience ships blur the line between civilian maritime activity and state‑directed coercion, complicating attribution and response efforts. He called for stronger international controls to curb their misuse.
Hegseth Emphasises Alliance Burden‑Sharing
Pete Hegseth pressed allies in Europe and Asia to increase defence spending, framing the US desire for “partners not protectorates.” He invoked Theodore Roosevelt’s “speak softly, but carry a big stick” philosophy, asserting that the United States will maintain a strong deterrent while seeking cooperative security arrangements. Hegseth’s remarks underscored the administration’s belief that a balanced burden‑sharing model is essential for a stable Indo‑Pacific.
Record US Defence Budget Aimed at Long‑Term Dominance
Hegseth announced that the Trump administration’s defence budget request stands at US$1.5 trillion (approximately A$2.085 trillion), describing it as a measure that will “unleash America’s arsenal of freedom” and expand military dominance for decades to come. Although he did not directly mention Taiwan, the budget signals a sustained commitment to maintaining US superiority in the region, particularly amid concerns over China’s assertive posture.
Taiwan Remains a Quiet but Pressing Concern
Despite the focus on undersea infrastructure and AUKUS capabilities, the issue of Taiwan lingered in the background. Hegseth refrained from directly addressing Taiwan during his Singapore briefing, even as analysts note growing unease in Taipei about the Trump administration’s perceived wavering commitment. Beijing’s “One China” principle continues to assert sovereignty over the island, while Taiwan’s government insists on self‑determination, leaving the situation a potential flashpoint that could influence future alliance strategies.