Connectivity

Submarine Cables: How They Connect Latin America to the World

When people picture the internet, the image that usually comes to mind is wireless: satellites, antennas, Wi-Fi. The reality is far more physical. Roughly 99% of international data traffic travels through fiber-optic cables laid on the seabed. Every search, every email between continents, and every cloud service a Latin American business uses passes, at some point, through a submarine cable.

What is a submarine cable?

A submarine cable is a run of fiber-optic cable installed on the ocean floor to carry data between continents. On the outside it's surprisingly thin, about the width of a garden hose in deep water, but inside it packs fiber strands capable of moving enormous volumes of information at the speed of light. Around those fibers, several layers of protection shield it against pressure, corrosion, and external damage, and at regular intervals repeaters are installed to amplify the signal so it doesn't degrade over thousands of kilometers.

How does this infrastructure work?

The principle is the same as any fiber network: information travels as pulses of light. What's different is the scale and the environment. A submarine cable connects landing stations on the coast of each country or continent; from there, traffic is distributed to terrestrial networks and finally reaches businesses and users.

Two characteristics make this infrastructure as robust as it is strategic:

Capacity and low latency

Submarine fiber moves volumes of data that no other technology matches today, and it does so with low latency: the signal covers intercontinental distances in fractions of a second. For latency-sensitive applications (financial transactions, video calls, cloud services), that speed is what makes operating across regions viable.

Redundancy and multiple routes

A single cable is a single point of failure: if it's damaged (by an anchor, an earthquake, or wear), the traffic that depended on it is cut off. That's why robust networks rely on multiple cables and alternate routes, so that if one fails, traffic is rerouted through another without leaving a region cut off. Redundancy isn't a luxury, it's what makes this infrastructure reliable.

How are they installed and maintained?

Laying a submarine cable is one of the most complex engineering feats in the industry. Specialized ships deploy the cable across thousands of kilometers, lowering it onto the seabed and, in areas near the coast (where the risk of damage from anchors or fishing nets is higher), burying it beneath the seafloor for protection. The route is carefully planned to avoid geological fault lines, zones of heavy fishing activity, and other risks.

Maintenance is just as demanding. When a cable is damaged, repair vessels have to locate the exact point of failure on the ocean floor, haul up the affected segment, repair it, and relay it. It's a process that can take days or weeks, which explains why redundancy, not depending on a single cable, is so critical to service reliability.

What happens when a cable fails?

Submarine cables are robust, but not invulnerable. Ship anchors, trawling nets, undersea earthquakes, and natural wear can damage them. When that happens in a region that depends on a single route, the effect is immediate: the international connection degrades or drops, affecting cloud services, communications, and operations that depend on intercontinental traffic.

This is where network architecture makes the difference. A region or provider connected by multiple cables and routes can reroute traffic when one fails, without users noticing. One that depends on a single link is exposed to a single incident cutting it off entirely. That's why the number and diversity of a provider's submarine routes is a direct indicator of how resilient its connectivity really is.

A strategic infrastructure, not just a technical one

Beyond their technical function, submarine cables have become strategic assets for the regions they connect. Whoever controls data routes controls, to a large extent, a region's ability to participate in the global digital economy. That's why the laying of new cables toward Latin America is significant news: every new route adds capacity, improves redundancy, and reduces dependence on a handful of legacy links.

For the region, this expansion carries a double value. On one hand, more international capacity enables the growth of digital services, the arrival of operations that depend on global connectivity, and the development of infrastructure like data centers. On the other, route diversity makes the region less vulnerable: the more paths that exist to the rest of the world, the lower the risk that a single incident affects the connectivity of entire countries. The robustness of this submarine network is, at bottom, a condition for the region's digital autonomy.

Why does this matter for businesses in the region?

For a Latin American company with operations or clients on other continents, the quality of its international connection depends directly on this submarine infrastructure. It isn't a distant technical detail: it defines how fast its cloud applications respond, how stable its communications are with offices abroad, and how exposed it is to an outage if its provider depends on a single route.

That's where the difference lies between a provider that resells third-party capacity and one with its own infrastructure. Having an extensive network of submarine cables with redundant routes makes it possible to offer reliable international connectivity without depending on someone else's capacity. That's the foundation on which Liberty Networks connects the region: its regional connectivity infrastructure rests on a proprietary network linking Latin America and the Caribbean with the rest of the world.