Meta Petal Cable: First Petabit Subsea Link to Power AI Agents

Meta is deploying the first transoceanic cable capable of transmitting one petabit per second, a capacity threshold necessary to sustain the massive data flows required by next-generation artificial intelligence agents. The new system, named Petal, will connect the United States and France across 4,300 miles of ocean floor and is scheduled to enter service in 2029.

This infrastructure milestone arrives as Meta shifts from social media connectivity to supporting autonomous software like Muse, its personal AI agent that topped Apple’s U.S. App Store charts within two weeks of its September 8 launch. Unlike traditional content delivery, AI agents require continuous, low-latency synchronization between user devices and remote inference clusters. Petal’s throughput of approximately 125,000 gigabytes per second doubles the capacity of current state-of-the-art submarine cables, providing the bandwidth headroom needed for real-time model interaction rather than static content streaming.

The technical leap relies on two-core fiber optics, which embed two distinct light paths within a single strand. This architecture allows Meta to double transmission capacity without a linear increase in power consumption or physical cable diameter. Power efficiency is a critical constraint in subsea engineering; repeaters placed along the cable to amplify signals are powered via high-voltage direct current from shore stations, and increasing conductor size for higher power loads significantly raises manufacturing complexity and cost. By maintaining standard form factors while doubling spectral efficiency, Petal avoids the diminishing returns that have historically capped submarine cable upgrades.

Petal represents a strategic pivot toward proprietary infrastructure control. While previous systems like MAREA were joint ventures with Microsoft and Telxius, Meta is increasingly building solo. The company now owns or co-owns more than 20 subsea cable projects touching six continents, but Petal and the forthcoming Project Waterworth signal a move toward exclusive ownership. Waterworth, announced in February 2025, will span over 31,000 miles connecting five continents and will be Meta’s third wholly owned system. Some segments will be buried at depths exceeding 4.3 miles to mitigate anchor damage and geopolitical risks associated with shallow-water landing zones.

This buildout occurs against a backdrop of surging capital expenditure. Meta projects 2026 capex between $130 billion and $145 billion, nearly double the prior year’s spend. Subsea cables, while expensive—with industry estimates suggesting Waterworth alone could exceed $10 billion—represent a fraction of total infrastructure costs dominated by GPU procurement and land-based data center construction. However, they remain the irreplaceable backbone of global AI operations. Satellite constellations cannot match fiber’s latency or volume, and terrestrial routes lack the geographic reach required for transatlantic and transpacific model serving.

The partnership ecosystem for Petal includes Japan’s NEC and Sumitomo Electric Industries for manufacturing, with French telecom Orange managing the Atlantic coast landing station. This division of labor reflects the specialized nature of modern submarine cable deployment, where no single entity controls the entire supply chain from glass fabrication to marine installation.

Industry analysts note that petabit-class cables mark the beginning of a new infrastructure cycle driven by AI training and inference demands rather than consumer video growth. Previous capacity expansions correlated with Netflix streaming adoption and cloud migration; the current wave is tied directly to token generation rates and model parameter counts. As AI agents integrate deeper into email, calendar, and financial workflows, the reliability and capacity of these undersea links become operational prerequisites rather than optional enhancements.

Meta’s 2Africa system, completed in core segments last year, already connects 33 countries and serves as a template for emerging market infrastructure integration. Petal extends this strategy to mature markets where existing capacity faces congestion from enterprise AI workloads. The cable’s 2029 activation timeline aligns with projected deployment schedules for next-generation large language models expected to demand sustained multi-petabit intercontinental bandwidth.