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 inaugurated the Svalbard Satellite Station (SvalSat) on a mountain plateau at 78°N, near Longyearbyen. This location is unparalleled on Earth: every satellite in low Earth orbit above 500 km passes within its range on every orbit. No other ground station can claim such universal coverage.

SvalSat was generating vast amounts of Earth observation data, with NASA as one of its primary customers. However, all this data had to traverse a single 55 Mbps Intelsat satellite link — the archipelago's sole connection to the outside world.

When Finland, already integrated into the global fiber network, competed against Svalbard for a major ground station contract in 2002, Norway recognized the satellite link's limitations could render SvalSat obsolete.

NASA committed $20 million over seven years, guaranteed through bandwidth purchases. The Norwegian Space Centre, a foundation with minimal equity, invested $300,000 in a feasibility study. Tyco Telecommunications secured the turnkey contract on March 7, 2003.

What followed was a race against Arctic ice.

25 Days. 2,700 km. One Window.

The <a href="/cable/svalbard-undersea-cable-system">Svalbard Undersea Cable System</a> comprises twin cables extending from Harstad on the Norwegian mainland to Breivika (Andøy), and 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 traverses the Greenland Sea, where the seafloor plunges from 300 meters to 2,700 meters at the continental shelf edge. Water temperatures remain near freezing year-round, and pack ice obstructs the route for ten months annually.

This left a narrow operational window: July and August.

Global Marine Systems began laying the cable on July 21, 2003, completing the deployment on August 15.

In just 25 days, 2,700+ km of twin submarine cable were installed through Arctic waters.

During the operation, a world record was set: 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 safeguard it from anchors and bottom trawling equipment.

Each cable incorporates eight fiber pairs:

• Initial capacity: 10 Gbps per cable

• Maximum capacity: 2,500 Gbps (utilizing all pairs and additional wavelengths)

• Repeaters: 20 per segment

• Signal regeneration: None — the signal traverses the entire 1,375 km without regeneration

The system employs clear-channel, protocol-independent transmission — a design that has ensured its relevance for over two decades.

January 7, 2022: The Cable Goes Dark

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

Space Norway, the state-owned operator, pinpointed 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 notable. Weeks later, Russia invaded Ukraine. The cable break became one of the initial incidents in a series of suspicious disruptions 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 left reliant on a single cable, with no redundancy. The entire archipelago — home to 2,500 residents, research stations, and the SvalSat ground station serving NATO allies — depended on one surviving fiber.

Norway disclosed the disruption on January 10. Two days earlier, the new UK chief of defense staff had publicly warned of increased Russian activity 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 seabed searching, the crew located the damage. Two shifts — totaling fifty personnel — worked around the clock. Remotely operated underwater vehicles (ROVs) were deployed to retrieve the cable from the depths and splice the fiber.

When the cable was brought aboard, the damage was evident:

The outer jacket was crushed. This was consistent with a heavy object being dragged across the cable. Experts who reviewed photographs for Norwegian broadcaster NRK assessed the damage as likely caused by an anchor or trawl, though other causes could not be definitively excluded.

One expert from a major Norwegian subsea cable company noted no signs of the cable being hooked by a dragged anchor but observed clear evidence of external compression.

The investigation's findings have not been fully disclosed. Space Norway subsequently joined ASN, an international organization ensuring rapid access to cable repair ships — a safeguard for future incidents.

<a href="/cable/arctic-way">Arctic Way</a>: Three Cables for the First Time

The 2022 incident underscored the inadequacy of relying on twin cables nearing the end of their operational life.

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 only to a Norwegian military weather and radio station, currently relies solely on satellite communication. The Norwegian Armed Forces tasked Space Norway with establishing high-speed fiber to Jan Mayen by 2027, aligning with the construction of a new military station.

The existing cables will not be immediately retired. While operational, they will serve as backups, granting Svalbard three-cable resilience for the first time in its history.

Norway's Defense Minister Tore O. Sandvik emphasized the strategic importance of the subsea cable to Jan Mayen, describing it as vital 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 merely Svalbard's satellite station — it is a cornerstone of global infrastructure.

Over 100 satellite antennas are stationed on the mountain plateau above Longyearbyen, downloading data from every polar-orbiting satellite on every pass. This makes SvalSat indispensable 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 the cable was severed in January 2022, the disruption extended far beyond Svalbard's 2,500 residents. It impacted weather services, space agencies, and defense networks across half the planet. Norway's Office of the Auditor General classified the cable as critical to the nation's international obligations.

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

Norway's €240 million investment in cables to its most remote territories is not just about bandwidth. It is about sovereignty, security, and the understanding that in the 21st century, a severed cable can have consequences as profound as a closed border.

At 78° North, in waters frozen for most of the year, where polar bears outnumber network engineers, Norway has chosen to build — twice. This decision underscores the evolving significance of submarine cables in a connected and contested world.