Microsoft has joined a consortium led by Singapore-based Lightstorm to build a new subsea cable connecting India with Singapore and Malaysia, the companies announced on Thursday. T

he I-2SEA system will run 3,600 kilometres and is intended to support the AI, cloud and hyperscale workloads that have made India one of the world’s most contested data centre markets.

Alongside Microsoft and Lightstorm, the consortium includes Tata Communications, Singapore’s Singtel, ASEAN Cableship and Japan’s NEC Corporation, which typically handles subsea cable manufacturing and laying for projects of this scale.

The cable is expected to be ready for service in the fourth quarter of 2029, a timeline that gives the group roughly three years to survey routes, secure permits and lay cable across open ocean.

One landing station will sit at Machilipatnam, on the coast of the southern Indian state of Andhra Pradesh, chosen for its direct subsea path to data centre clusters further inland around Hyderabad.

Both Meta and Alphabet have separately announced data centre projects in the region, and a dedicated high-capacity route from the coast is the kind of infrastructure that tends to follow, rather than precede, that sort of hyperscaler commitment.

The timing fits a broader pattern of the last year, in which Microsoft has repeatedly attached itself to sovereign and regional infrastructure projects rather than building everything through its own balance sheet alone.

It has already committed more than $1 billion to Thailand and $3.2 billion to Sweden for cloud and AI infrastructure, on top of a reported $17.5 billion in commitments to expand its footprint inside India itself.

India is the reason this particular cable matters more than most subsea announcements. The country produces and consumes roughly a fifth of the world’s data while hosting only around 3% of global data centre capacity, a mismatch that has triggered a rush of hyperscaler and domestic capital into the market.

Google has pledged $15 billion to a data centre hub in the south of the country, and Reliance’s Jio Platforms has separately built out its own infrastructure ambitions. Jio filed in June for what would be India’s largest-ever IPO, partly to clear debt and free up capacity for its own AI and cloud investments.

Lightstorm itself is a comparatively young entrant riding that wave. The company already operates roughly 50,000 kilometres of fibre, split between 30,000 kilometres inside India and 21,000 kilometres across subsea Pacific routes, and has said it is evaluating an initial public offering as it expands across the Asia Pacific region.

A subsea cable of this size does not resolve capacity constraints on its own. It moves data between coasts faster and more reliably, which matters enormously for AI workloads that depend on shuffling large volumes of training and inference traffic across borders, but the compute itself still has to be built, powered and cooled on land.

What I-2SEA does is remove one of the more predictable bottlenecks between now and 2029, at a moment when every other part of the stack, power, chips, land, is already running short. Other hyperscalers are placing similar bets on Indian infrastructure at a similar pace.

Amazon has committed tens of billions of dollars to its own India programmes, and the Adani Group is pursuing a ten-year, $100 billion build-out of its own, which suggests the country’s capacity gap will take years of parallel construction to close, rather than any single project.

NEC’s involvement is also notable in its own right, given the company’s long track record laying and maintaining transpacific and Asian subsea routes.

None of the consortium members disclosed the project’s cost, and none offered a breakdown of how construction and operating expenses will be split among the six partners. That detail, along with the permitting timelines in each of the three landing countries, will likely surface as the project moves from announcement to construction.