China Mobile

On 22 July, the Southeast Asia–Hainan–Hong Kong (SEA-H2X) international submarine cable, led and invested in by China Mobile, completed its system acceptance test and launched commercially. As the project’s largest investor, China Mobile holds key management responsibilities and continues to play a driving role in its execution.

The SEA-H2X international submarine cable spans approximately 5,746 kilometres, featuring eight fibre pairs along the trunk and a system design capacity exceeding 200 Tbps. It connects Hainan, China; Hong Kong, China; the Philippines; Thailand; and Singapore. The project employs industry-leading open cable access technology, with spectrum-sharing capabilities. It also incorporates advanced core submarine equipment to deliver ultra-high transmission capacity while effectively enhancing operational security, service configuration agility and reliability in complex networking environments.

China Mobile has invested in and constructed four trunk fibre pairs linking Hong Kong, China, and Singapore, as well as branch segments to Hainan, China, the Philippines and Thailand, securing more than 100 Tbps of dedicated bandwidth upon commissioning. As the operator of the SEA-H2X Network Operations Centre (NOC), China Mobile provides professional services including real-time monitoring, fault diagnosis and performance optimisation, comprehensively ensuring the safe and stable operation of the submarine cable system and improving users’ network experience.

In response to the rapidly growing demand for computing power interconnection in the AI era, SEA-H2X will further improve China Mobile’s communications infrastructure across Greater China and the Asia-Pacific region. It will help build a low-latency computing power circle of approximately 30 milliseconds between China and Southeast Asia, while providing low-latency, end-to-end security and cost-effective computing power scheduling capabilities.

China Mobile will integrate SEA-H2X with its existing Asia-Pacific submarine cable systems, including APG, SJC and SJC2, as well as intercontinental cables including SEA-ME-WE 5, PEACE and the IAX system. These will be combined with its global terrestrial network, points of presence, data centres and intelligent computing resources to establish a cross-continental transmission corridor spanning the Asia-Pacific region, the Middle East and Europe.

This will enhance the resilience of the global communications network and provide a more reliable, one-stop global connectivity service.

The commercial launch of the SEA-H2X cable marks a significant milestone in China Mobile’s efforts to advance high-quality digital infrastructure under the Belt and Road Initiative. By forging closer links between the Guangdong–Hong Kong–Macao Greater Bay Area, the Hainan Free Trade Port and key Southeast Asian markets, the project provides a robust network foundation to support the overseas expansion of Chinese enterprises and drive digital development across the region.

Looking ahead, China Mobile will leverage the deployment of SEA-H2X to deepen international digital cooperation, injecting new momentum into the growth of regional and global digital economies.

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