Antarctica: The Last Continent Without a Submarine Cable — Where Scientists Schedule Their Internet by the Hour

The Continent That Schedules Its Internet

At the Amundsen-Scott South Pole Station, you don't just open a browser. You check the satellite schedule first.

The station relies on NASA's TDRS satellites, which orbit so high that they only rise above the Antarctic horizon for a few hours each day. When they do, the entire station — up to 1,000 people during the austral summer — shares a single connection of roughly 17 Mbps. The schedule shifts by four minutes every day due to the difference between sidereal and solar time.

Round-trip latency: 750 ms. Packet loss: 10%. Speed per person: approximately 40 kbps.

To put that in perspective: a single household in most developed countries has faster internet than an entire Antarctic research base housing a thousand people. A video call is unreliable. Cloud services time out. Scientists must book their upload slots in advance, competing for bandwidth with operational traffic and fellow researchers. Loading a modern webpage can take minutes.

As of October 2023, South Pole had connectivity for only a few hours per day — when the satellites were above the horizon and the station was authorized to use them.

Seven Continents, Six Cables, One Exception

Every continent on Earth is connected by submarine fiber optic cables. Every continent except Antarctica.

The numbers tell the story:

Seventy research stations. Thirty countries. Zero submarine cables.

Why Not Just Lay One?

The Drake Passage — 1,000 km from Chile to the Antarctic Peninsula — is the most obvious route. It's also one of the most hostile bodies of water on the planet.

Water temperature: below -2°C year-round, dropping to -58°C at the surface in winter. Currents: the Antarctic Circumpolar Current, the strongest ocean current on Earth, pushing 130 million cubic meters per second through the passage. Winds: sustained speeds exceeding 100 km/h. Icebergs: some the size of small countries, calving unpredictably from ice shelves and scraping the ocean floor at depths that would sever any cable.

Sailors call the Drake Passage the roughest stretch of water on Earth. Cable engineers have called it something worse: unbuildable.

But the real obstacle isn't engineering — it's economics. Antarctica has no permanent population. The number of inhabitants fluctuates from roughly 1,000 in winter to 4,400 in summer. Building a business case for a submarine cable serving a few thousand seasonal scientists has always been nearly impossible.

The Satellite Workarounds

Different stations have found different solutions, all with significant limitations:

• McMurdo Station (US): 17 Mbps shared connection. Began testing Starlink in September 2022 — by 2024 it had become the best connectivity option on the continent
• Australian stations: 9 Mbps symmetric connection via Speedcast
• Rothera (UK): Trialed Eutelsat OneWeb's LEO service in 2024, achieving up to 120 Mbps — a breakthrough, but still satellite
• Scott Base (NZ): C-Band via Spark NZ; began Starlink trials in April 2023
• South Pole: TDRS relay at 50 Mbps peak, available only during satellite windows

Starlink's arrival in Antarctica in 2022 was a genuine milestone — SpaceX announced it was now operating on all seven continents, using inter-satellite laser links to reach the polar regions. But Starlink is still satellite internet: weather-dependent, capacity-limited, and not a substitute for fiber.

Chile's 1,850 km Gamble

In February 2025, Chile's Undersecretariat of Telecommunications formally launched a feasibility study for what would be the most extraordinary submarine cable ever attempted: a fiber link from Puerto Williams — the world's southernmost city — across the Drake Passage to King George Island in Antarctica.

The project didn't come from nowhere. Chile had already built Fibra Óptica Austral — a 3,000 km cable running from Santiago to Puerto Williams, completed in 2020. For the first time in history, fiber optic cable reached the doorstep of Antarctica.

The feasibility study was conducted by Pioneer Consulting and Salience Consulting, funded by the Development Bank for Latin America (CAF). The first executive report was delivered on March 5, 2026 — six days before Chile's presidential transition.

The findings:

• Minimum configuration: 1,850 submarine km connecting Chile's permanent bases on King George Island and the Antarctic Peninsula
• Extended configurations: four expansion options reaching bases operated by 15 additional countries — including the US, China, Russia, Germany, and South Korea
• Operational timeline: 2034 to 2058 — a 25-year horizon
• SMART technology: the cable would simultaneously function as a scientific sensor network, detecting seismic activity, measuring ocean temperature, and monitoring perturbations in real time along the ocean floor. Japan has spent over $1 billion in 15 years building similar networks in the North Pacific

This is not a telecommunications project measured in quarters. It's measured in decades.

The Geopolitical Dimension

The Antarctic cable project does not exist in a vacuum. In the second half of 2025, Chile authorized the HMN-TS cable connecting Valparaíso to Hong Kong — built with Huawei Marine Networks technology. In February 2026, weeks before the change of government, the United States revoked visas of three Chilean officials involved in that decision.

The message was clear: submarine cable routes have become a frontline of geopolitical competition.

The Antarctic cable is a fundamentally different project — multilateral by design, not tied to Chinese technology, built with explicit geopolitical neutrality as a requirement. But it exists in a world where every new cable route is scrutinized through a strategic lens.

What 750 Milliseconds Means for Science

For researchers spending months in isolation, the difference between satellite and fiber is not about convenience — it's about capability.

With satellite: data uploads are batched and scheduled. Climate monitoring transmits in chunks. High-resolution imagery waits weeks for transfer. Collaboration happens by email, not in real time.

With fiber: continuous data streaming. Real-time collaboration with colleagues worldwide. On-site processing of satellite imagery. The SMART sensors in the cable itself generating continuous oceanographic and seismic data.

Until that cable arrives — if it arrives — Antarctica remains the last digital frontier. A continent where loading a webpage is an achievement, a video call is a luxury, and the internet comes and goes with the satellites overhead.

Six continents have submarine cables. The seventh is still waiting.