I-2SEA Subsea Cable for AI: Microsoft Joins the Lightstorm Consortium

On July 3, 2026, Microsoft joined the Lightstorm consortium to build I-2SEA, a subsea cable intended for AI workloads on the India–Singapore–Malaysia route.

What is the I-2SEA system

The I-2SEA subsea cable system will stretch 3,600 kilometers and is being built specifically for the load generated by AI services, cloud platforms and hyperscale operations. This class of traffic is especially demanding on bandwidth and latency: AI models serving requests in real time do not tolerate unstable links.

Key project parameters:

• Name: I-2SEA
• Route: India — Singapore — Malaysia
• Length: 3,600 km
• Consortium leader: Lightstorm (Singapore)
• Announcement date: July 3, 2026

Lightstorm specializes in building and operating subsea cable systems in the Asia-Pacific region. The consortium model spreads the enormous capital costs, which run to hundreds of millions of dollars for systems like this, across several participants, each of which receives a guaranteed share of capacity proportional to its contribution.

Why Microsoft is building its own cables

The largest technology companies long ago moved beyond leasing bandwidth from commercial telecom operators. Owning cables, or holding a guaranteed share in a consortium, gives hyperscalers predictable capacity, control over routes and independence from third parties. All three are critical for AI infrastructure, where connectivity outages directly affect service quality.

Microsoft already participates in a number of subsea cable consortia linking the US with Europe and the Asia-Pacific region. I-2SEA will add to the infrastructure needed to support Azure cloud regions in India and Southeast Asia. Without sufficient subsea capacity between India and global network hubs, even the most powerful local data centers will not be able to run at full capacity.

India has become one of the most competitive markets in the world for data hosting. Several leading technology companies are increasing their investment in local data centers at the same time, and rapidly growing domestic demand for AI services is creating a sustained need for high-capacity cross-border links.

Subsea infrastructure as a field of competition

The global race for dominance in AI infrastructure is playing out on two levels: on land, in the construction of hyperscale data centers, and underwater, in the laying of cables that connect those facilities to the rest of the world. The subsea layer often stays in the shadow of public announcements, even though it determines how available cloud services actually are to users in Asia.

Singapore has long been the key subsea cable hub in the region: dozens of systems pass through it, linking Asia with Europe, the Middle East and the Pacific. Adding a direct route to India via I-2SEA will improve the reliability and capacity of the Indo-Pacific segment of the global network.

Malaysia, the cable's third landing point, is also strengthening its position as a regional hub for hyperscale infrastructure: several major providers have already announced data center construction in the country.

What this means

Microsoft joining the Lightstorm consortium is another signal that leading AI companies treat physical telecom infrastructure as a strategic asset, not merely a utility. For India and Southeast Asia, the project means wider availability of AI services: more capacity, lower latency, broader reach. Ultimately, investments like this will determine where, and how quickly, next-generation AI tools become available.