In a span of fewer than ten seconds, the gleaming silver airships designed by Kelluu can ascend swiftly from the ground into the open skies above eastern Finland, effortlessly clearing the uppermost treetops that mark the region’s rugged landscapes. Their motors emit a rhythmic, mechanical hum, while each vessel tilts gracefully upward with its aerodynamic nose pointed toward the heavens. Although the gas-filled blimp was a 19th‑century invention, the Finnish start‑up is placing its confidence in an advanced reinvention of this historical concept to assist Western powers in protecting their borders and strengthening their surveillance capabilities.
Kelluu, headquartered in Joensuu—a Finnish city positioned roughly fifty miles west of the Russian frontier—has introduced a new generation of compact hydrogen‑filled airships powered by small propellers. The company believes these aircraft can bridge a long‑standing operational gap between drones, planes, and satellites, offering persistent monitoring for both battlefields and border regions. Its strategy is already bearing fruit: Kelluu has become the first participant of NATO’s Defence Innovation Accelerator for the North Atlantic to formalize a contract with a Western member state under the alliance’s recently created innovators’ initiative. This achievement underscores its growing reputation among defense partners seeking versatile, low‑cost surveillance platforms.
The concept is simple but potent. A network of remotely piloted or semi‑autonomous airships can be outfitted with a variety of cameras and advanced sensory equipment. Such fleets could be continuously rotated to observe designated sectors around the clock, ensuring consistent coverage with minimal human oversight. According to the company, Kelluu’s airships can be largely automated, requiring only that an operator input a target coordinate or flight plan before the system conducts take‑off, cruising, and landing on its own.
While these airships lack the robustness to survive direct engagement at the front lines of conflict, their endurance and stability make them effective tools for long‑term observation of rear areas or zones adjacent to active combat. Traditional small drones, constrained by limited battery capacity, rarely remain airborne more than a few hours, and conventional reconnaissance aircraft—though capable—require trained crews and are costly to deploy and maintain. Satellites, for their part, must wait for their orbits to pass above specific coordinates before gathering intelligence, creating intermittent rather than continuous oversight. In contrast, Kelluu’s airships can loiter over a region for up to half a day at a time, greatly extending operational duration.
As Niko Kuikka, the firm’s head of engineering, explained during an interview conducted within Kelluu’s Finnish workshop, endurance is at the heart of the technology’s appeal. “Our clients are not primarily concerned about the particular platform we use,” he noted. “What they value is the ability for it to remain airborne for twelve consecutive hours—that longevity is our defining capability.” Measuring approximately the length of a city bus and with a slender width of about six and a half feet, these modern vessels are diminutive compared to the monumental Zeppelins that once dominated European skies during World War I. Each craft houses its own fuel supply, propeller system, and onboard computer, all calibrated for modularity so operators can attach payloads of up to eleven pounds, such as high‑resolution cameras or radar units. Elevated vantage points give their sensors a remarkable capacity to capture expansive areas with clarity.
Kuikka emphasized that this compact size, far from being a limitation, enhances the efficiency and flexibility of the design. The airships can cruise at speeds reaching thirty‑three miles per hour and are light enough to be transported in standard shipping containers. This portability enables deployment by only a single individual without the need for a complex logistical team. Moreover, the streamlined design contributes to affordability and scalable mass production. As Kuikka remarked, customers purchasing large fleets need not fear that the loss of a few vehicles would seriously degrade operational readiness—a sharp contrast to the high stakes associated with traditional aircraft. The exact pricing remains undisclosed, but the company maintains that the entire system is optimized to be cost‑effective. In Kuikka’s words, “Having an expensive, fragile object floating visibly in hostile airspace would be strategically and economically illogical.”
Inside Kelluu’s modest workshop, teams work diligently on the final assembly of each airship, filling its envelope with hydrogen—a light yet highly flammable gas that simultaneously supplies lift and powers the propeller engines. Above the workshop floor, in a compact loft, roughly ten software engineers refine the proprietary control interface and networking platforms required to supervise fleet operations in real time. This close collaboration between hardware assembly downstairs and software design upstairs reflects the company’s integrated engineering ethos.
Joensuu, the firm’s base of operations, is home to approximately seventy‑eight thousand residents and lies just west of Russian Karelia, placing it in one of Finland’s most geopolitically sensitive zones. Kuikka argues that this location confers a distinct competitive advantage. Proximity to the tense border means that Kelluu’s systems are constantly exposed to intense electronic interference—both intentional and accidental—emanating from transmitters in Russia as well as countermeasures on the Finnish side. The team half‑jokingly refers to this as receiving “free interference,” since other companies might have to simulate such conditions artificially or pay for testing facilities. Instead, Kelluu’s airships regularly prove their resilience under genuine electronic warfare conditions, enduring signal jamming and GPS spoofing. As Kuikka put it, “We routinely experience various forms of disruption from both sides of the frontier, and those challenges have already demonstrated our equipment’s resistance to GPS denial and similar electronic attacks.”
Beyond electronic interference, the Scandinavian climate imposes formidable physical challenges. Joensuu lies roughly three hundred and forty miles south of the Arctic Circle, where winter temperatures plunge well below freezing—reaching minus fifteen degrees Fahrenheit during January—with icy winds that test material durability. As a result, Kelluu’s engineers have designed their craft to endure such brutal conditions, ensuring functionality in environments where other aerial platforms might fail. This resilience enables the company to position its airships as ideal tools for monitoring Arctic bases, resource zones, or remote borders. By keeping the aircraft operational for extended missions, Kelluu reduces the number of ground personnel needed for maintenance and supervision. “Our objective is to extend endurance to multi‑day operations,” Kuikka added, “minimizing the number of people required in the field.”
Joensuu’s economy once leaned heavily on Russian tourism, but that source of revenue vanished after 2022, when the full‑scale invasion of Ukraine prompted Finland to halt the issuance of tourist visas and later to close the 833‑mile land border between the nations. Consequently, Finnish authorities now focus intently on strengthening eastern border defenses and confronting hybrid threats such as orchestrated illegal migration allegedly used as a tactic of gray‑zone warfare. Although Kelluu was founded back in 2018, long before these tensions escalated, the evolving geopolitical context has sharply increased its relevance. Originally, the firm developed its airships for civilian applications such as inspecting power lines or surveying infrastructure. However, shifting global dynamics have transformed its technology into a highly sought‑after element of Europe’s defense modernization.
Today, Kelluu stands among fourteen companies advancing to the second phase of NATO’s Defence Innovation Accelerator program, known as DIANA, which aims to expedite the adoption of emerging technologies by member militaries within two years. Out of approximately 2,600 applicants, Kelluu distinguished itself not only through technical ingenuity but also by becoming the first venture in DIANA’s 2025 cohort to finalize a national trial agreement via the alliance’s newly launched Rapid Adoption Service. While neither NATO nor the company has revealed the specific member state involved, DIANA’s challenge manager, Fabrizio Berizzi, publicly commended the airships for their exceptional agility, endurance, and suitability for uninterrupted 24/7 observation missions. According to Berizzi, Kelluu’s solution occupies a unique niche between conventional uncrewed aerial systems and manned aircraft, enabling coverage at intermediate altitudes that previously lacked efficient monitoring tools. He further noted that the craft’s design allows operation in heavily contested electromagnetic environments, where radio interference or radar detection would normally compromise most systems. With their low radar cross‑section, the Finnish airships remain comparatively difficult to detect.
Kelluu closely guards the precise composition of the shimmering metallic material that gives its hull a mirror‑like appearance. When pressed on whether this exterior reduces radar visibility, company representatives declined to comment. Kuikka did, however, emphasize that the aircraft’s defining trait is its ability to safely contain hydrogen gas within a semi‑rigid frame. Hydrogen, while inherently flammable and riskier than helium, possesses superior lifting power and is much less expensive. In contrast to the fully rigid Zeppelins of a century ago or the modern multimillion‑dollar advertising blimps that deflate without internal structure, Kelluu’s design relies on partial rigidity—combining safety, strength, and efficiency. Chief Executive Officer Janne Hietala observed that lighter‑than‑air technologies have long been overlooked in defense circles, a skepticism rooted partly in tragedies such as the Hindenburg disaster. Yet, NATO evaluators themselves were astonished by the resilience of Kelluu’s small aircraft when subjected to demanding field demonstrations, including maritime tests over the Atlantic. “At first, hardly anyone believed our specifications,” Hietala recalled. “They assumed the airships would simply drift away in high winds. But once we deployed, they saw that our system genuinely works and performs as claimed.”
Currently, Kelluu operates a modest active fleet of fewer than twenty airships, though expansion plans are ambitious. Some units are already being tested or utilized abroad, including in Latvia. For now, the company manages and maintains these fleets for customers, but discussions are underway regarding the potential for national militaries to assume direct control of their own Kelluu units. Looking ahead, Hietala envisions exponential scaling: “Our short‑term goal is to produce over five hundred airships for deployment across Western nations, and ultimately, we aim for a fleet exceeding three thousand five hundred operational units.” If realized, this vision would represent a widespread implementation of lightweight, cost‑effective aerial surveillance—a modern reinterpretation of a centuries‑old concept, engineered for a world defined by digital warfare and Arctic endurance.
Sourse: https://www.businessinsider.com/kelluu-finland-airship-nato-russian-jamming-surveillance-arctic-2025-11
