Svalbard: How Norway Laid the World's Northernmost Cable Through Arctic Storms — And Why Someone Cut It

$20 Million From NASA to Lay Cable Through Ice

In 1999, Norway opened the Svalbard Satellite Station — SvalSat — on a mountain plateau at 78°N, near Longyearbyen. The location was unique on Earth: every satellite in low Earth orbit above 500 km passes within range on every single orbit. No other ground station can make that claim.

SvalSat was generating massive amounts of Earth observation data. NASA was one of its biggest customers. But all that data had to squeeze through a single 55 Mbps Intelsat satellite link — the archipelago's only connection to the outside world.

When Finland — already connected to the global fiber network — bid against Svalbard for a major ground station contract in 2002, Norway realized the satellite link was about to make SvalSat irrelevant.

NASA committed $20 million over seven years, paid through guaranteed bandwidth purchases. The Norwegian Space Centre — a foundation with almost no equity — spent $300,000 on a feasibility study. Tyco Telecommunications won the turnkey contract on March 7, 2003.

What followed was a race against ice.

25 Days. 2,700 km. One Window.

The Svalbard Undersea Cable System consists of twin cables running from Harstad on the Norwegian mainland to Breivika (Andøy), then onward to Hotellneset near Longyearbyen:

Segment 1 (Harstad → Breivika): 74 km and 61 km
Segment 2 (Breivika → Svalbard): 1,375 km and 1,339 km

The route crosses the Greenland Sea, where the seafloor drops from 300 meters to 2,700 meters at the continental shelf edge. Water temperature hovers near freezing year-round. Pack ice blocks the route for ten months of the year.

That leaves one window: July and August.

Global Marine Systems started laying cable on July 21, 2003. They finished on August 15.

25 days to deploy 2,700+ km of twin submarine cable through Arctic waters.

During the operation, they set a world record: plowing cable into the seabed at a depth of 1,671 meters. In areas frequented by fishing trawlers, the cable was buried two meters below the seabed to protect against anchors and bottom trawling gear.

Each cable carries eight fiber pairs:

• Initial capacity: 10 Gbps per cable
• Maximum capacity: 2,500 Gbps (using all pairs and additional wavelengths)
• Repeaters: 20 per segment
• Signal regeneration: none — the signal travels the entire 1,375 km without regeneration

The system uses clear-channel, protocol-independent transmission — a design choice that kept it relevant for over two decades.

January 7, 2022: The Cable Goes Dark

On the night of January 7, 2022, one of the two Svalbard cables suddenly lost power.

Space Norway, the state-owned operator, located the break between 130 and 230 km from Longyearbyen — precisely where the Greenland Sea floor drops from 300 to 2,700 meters.

The timing was significant. Weeks later, Russia invaded Ukraine. The cable break became one of the first incidents in what would become a pattern of suspicious damage to undersea infrastructure across Northern Europe:

• January 2022: Svalbard cable severed
• September 2022: Nord Stream pipelines sabotaged in the Baltic Sea
• October 2023: Communications cable and gas pipeline between Finland and Estonia cut
• November 2024: Two Baltic Sea cables damaged within days of each other

Svalbard was suddenly running on a single cable. Zero redundancy. The entire archipelago — 2,500 residents, research stations, and critically, the SvalSat ground station serving NATO allies — depended on one surviving fiber.

Norway announced the disruption on January 10. Two days earlier, the new UK chief of defense staff had given his first press interview warning that Russia was increasing its capacity to act aggressively near undersea cables.

The Repair: 40 Hours Searching, One Month Working

Organizing the repair took months. In June 2022, the cable ship "Cable Vigilance" arrived for a month-long mission.

After 40 hours of searching along the seabed, the crew found the damage. Two shifts — fifty people total — worked day and night. They deployed remotely operated underwater vehicles (ROVs) to retrieve the cable from the deep and splice the fiber.

What they found when they hauled the cable aboard:

The outer jacket was crushed. Consistent with a heavy object being dragged across the cable. Multiple experts who examined photographs for Norwegian broadcaster NRK assessed that the damage patterns were consistent with an anchor or trawl being dragged over the cable — though they could not definitively rule out other causes.

One expert — a manager at a major Norwegian subsea cable company — noted there were no signs of the cable being hooked by a dragged anchor, but clear evidence of external compression.

The investigation's conclusion has never been made fully public. Space Norway subsequently joined ASN, an international organization providing rapid access to cable repair ships — insurance against next time.

Arctic Way: Three Cables for the First Time

The 2022 incident made one thing clear: twin cables approaching end-of-life were not enough.

In February 2025, Space Norway announced Arctic Way — a new 2,350 km submarine cable system:

Route: Bodø (mainland Norway) → Jan Mayen → Longyearbyen (Svalbard)
Latitude range: 67°N to 78°N — entirely within the Arctic Circle
Cost: 2.8 billion NOK (~€240 million)
Contractor: SubCom (successor to Tyco, which built the original system)
Target date: 2028

Jan Mayen is particularly significant. This volcanic island — home to nothing but a Norwegian military weather and radio station — currently has zero fiber connection. All communication is satellite-only. The Norwegian Armed Forces specifically tasked Space Norway with establishing high-speed fiber to Jan Mayen by 2027, timed to coincide with a new military station being built there.

The old cables won't be immediately retired. While they remain functional, they serve as backup — giving Svalbard three-cable resilience for the first time in its history.

Norway's Defense Minister Tore O. Sandvik stated directly: the subsea cable to Jan Mayen is important for "strengthening our situational awareness and overview of a strategically crucial area for Norway and our allies."

Why One Arctic Cable Matters to the World

SvalSat is not just Svalbard's satellite station — it is a critical node in global infrastructure.

More than 100 satellite antennas sit on the mountain plateau above Longyearbyen. They download data from every polar-orbiting satellite on every pass. This makes SvalSat essential for:

• Weather forecasting across the Northern Hemisphere
• Earth observation data for climate science
• Military communications for NATO
• Space agency operations for NASA, ESA, EUMETSAT, and others

When that cable was cut in January 2022, the disruption didn't just affect 2,500 Arctic residents. It degraded a node serving weather services, space agencies, and defense networks across half the planet. Norway's Office of the Auditor General described the cable as critical for the country's international obligations.

The Arctic Way project reflects a broader shift: submarine cables are no longer just commercial infrastructure. They are strategic assets, military communication lines, and potential targets.

Norway's decision to invest €240 million in cables to its most remote territories is not about bandwidth. It's about sovereignty, security, and the recognition that in the 21st century, a severed cable can be as consequential as a closed border.

At 78° North, in waters that freeze for most of the year, where polar bears outnumber network engineers, Norway chose to build — twice. That choice says everything about what submarine cables have become.