Amazon just announced Fastnet, its first solo subsea cable project connecting Maryland to Ireland with 320 terabits per second capacity - enough to stream 12.5 million HD movies simultaneously. The move marks a strategic shift as AWS doubles down on infrastructure ownership to meet exploding AI and cloud demand, setting up a 2028 showdown with Google and Meta in the subsea arms race.
Amazon is taking the plunge on its biggest infrastructure bet yet. The company just broke ground on Fastnet, a massive subsea fiber-optic cable that'll stretch 3,000 miles from Maryland's Eastern shore straight to County Cork, Ireland, marking the first time the tech giant has gone solo on such a project.
The timing isn't accidental. Amazon's AWS division is seeing unprecedented demand for AI infrastructure, and the company needs dedicated bandwidth to keep pace. "Subsea is really essential for AWS and for any connectivity internationally across oceans," Matt Rehder, Amazon Web Services vice president of core networking, told CNBC in an exclusive interview. The admission reveals just how critical these underwater highways have become.
Fastnet's specifications are staggering. The cable will deliver over 320 terabits per second - that's enough bandwidth to simultaneously stream 12.5 million HD movies or handle the equivalent of millions of AI training sessions. For context, that's roughly 50 times faster than what most major cities consider high-speed internet today.
This represents a major strategic shift for Amazon. Previously, the company participated in subsea projects like Jako, Bifrost, and Havfrue as part of industry consortiums, sharing costs and capacity with other tech giants. But Fastnet changes that dynamic entirely, giving AWS complete control over a transatlantic data pipeline.
The move comes as subsea cables have become the invisible backbone of the modern internet. These underwater fiber networks carry over 95% of international data and voice traffic, from government communications to financial transactions. Without them, companies would have to rely on satellite connectivity, which Rehder notes has "higher latency, higher costs and you just can't get enough capacity."
Amazon isn't alone in this infrastructure race. Google and Meta have been aggressively expanding their subsea footprint, with Microsoft not far behind. The competition reflects a broader trend of tech giants vertically integrating their infrastructure to support AI workloads that demand massive, reliable bandwidth.
The financial implications are enormous, though Amazon declined to disclose Fastnet's construction costs. Industry experts estimate major transatlantic cables typically run between $300 million to over $1 billion, depending on capacity and route complexity. The 2028 completion timeline suggests Amazon is fast-tracking the project to meet urgent demand.
For AWS customers, Fastnet promises significantly lower latency between Amazon's US East Coast data centers and its growing European operations. That matters enormously for AI applications, where milliseconds can make the difference between competitive advantage and also-ran performance. Financial services firms running high-frequency trading algorithms will particularly benefit from the dedicated route.
The cable also strengthens Amazon's network resilience at a time when subsea infrastructure faces increasing scrutiny over security and reliability. Recent incidents involving cable cuts and alleged sabotage have highlighted how vulnerable these underwater lifelines can be. By owning Fastnet outright, AWS gains both control and redundancy in its transatlantic connectivity.
Industry watchers see this as Amazon playing catch-up with rivals who've been investing heavily in subsea infrastructure. Google operates multiple private cables including Dunant and Grace Hopper, while Meta has invested in projects like 2Africa and Echo. Amazon's solo approach with Fastnet suggests the company believes it needs dedicated capacity rather than shared resources.
The 2028 target date puts Fastnet directly in competition with other major subsea projects coming online around the same timeframe. Success will likely be measured not just in technical performance, but in how effectively Amazon can leverage the dedicated capacity to win cloud customers in AI-intensive industries.
Fastnet represents Amazon's most aggressive infrastructure play yet, signaling the company's recognition that owning the pipes matters as much as what flows through them. With AI workloads demanding unprecedented bandwidth and latency performance, Amazon's decision to go solo on this transatlantic lifeline could define AWS's competitive position for the next decade. The 2028 timeline means we'll know soon enough whether this billion-dollar bet pays off in the subsea arms race.
