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Construction on the Fehmarnbelt tunnel resumed gradually after a cyberattack disrupted Femern Link Contractors’ (FLC) IT systems. In an update on 16 October 2026, project company Femern A/S said some site systems were still affected while earthworks, some concrete work and reinforcement-steel production continued. A 21 October update said preparations for the first special-element immersion had resumed, but no immersion date had been announced.
What happened in the Fehmarnbelt tunnel cyberattack?
FLC, the main contractor building the 18-kilometre tunnel between Denmark and Germany, was targeted overnight into Monday, 12 October 2026. Femern A/S reported on 16 October that the attack affected FLC’s IT systems and that several site systems remained affected. The company described a gradual return to work rather than a full restoration. Femern A/S update, 16 October 2026; Femern A/S project overview.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe 18-kilometre figure describes the tunnel project’s overall length, not the scope or consequences of the cyberattack. The public updates did not quantify affected systems, downtime, financial losses or schedule impact.
Which construction work continued or resumed?
According to the 16 October project update, activity varied by work area: some construction continued without interruption, while other operations were being brought back gradually.
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- Earthworks: Continued without disruption on both the Danish and German sides.
- Concrete work: Some concrete work could proceed.
- Reinforcement steel: Production was underway in the panel factory on the Danish side.
- Rødbyhavn production facility: Femern A/S said it was expected to resume operations soon, but did not give a restart date.
The project-company update did not say that every site system or operation was back to normal. Sund & Bælt release carried by Via Ritzau, 16 October 2026.
What is the status of the first special tunnel element?
Preparations for immersing the first special element had resumed by the week before the 21 October report, but an immersion date had not been announced.
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On 16 October, Fehmarnbelt project Contract Director Matthias Laubenstein said offshore tests with immersion pontoon IVY were taking place that week and that preparations for the first special element were continuing. The later report from FemernBusiness said IVY had been assembled as one vessel and that some minor work remained before it could lift the element. Sund & Bælt press officer Andrew Crone-Langkjær said preparations had resumed the previous week. FemernBusiness, 21 October 2026.
The October 16 statement described that week’s tests; the October 21 report is the later status update. Neither source announced when immersion would take place.
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Who was responsible, and how did the attackers get in?
Those details had not been established publicly in the October reports. NDR reported on 16 October that the method of access and the identity of those responsible were unknown. Femern A/S said Denmark’s National Special Crime Unit was investigating and that it could not provide further details during the investigation. NDR/tagesschau report, 16 October 2026.
The available accounts do not establish that the incident involved ransomware or that data was stolen. Those claims should not be treated as facts on the basis of the published updates.
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Does the cyberattack mean the tunnel project is delayed?
The October updates do not establish a project-wide delay or quantify any schedule impact. They report continuing and resumed work in specific areas, alongside systems and a production facility whose status was not fully resolved in the published information.
As of the 21 October report, preparations for the first special-element immersion were moving forward, but the date remained unannounced. That leaves the timing of the next milestone open; it does not, by itself, show whether the overall tunnel schedule has changed.
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Frequently Asked Questions
What is the Fehmarnbelt tunnel being built to connect?
The project is an 18-kilometre tunnel between Denmark and Germany, according to Femern A/S. The project’s overall length is separate from the unquantified effects of this cyberattack.
What is an immersion pontoon used for?
In this project, immersion pontoon IVY is being prepared to lift and handle a special tunnel element for immersion. The October 21 report said the vessel was assembled as one unit, with some minor work still to do before it could lift the element.
Which Danish authority is investigating the attack?
Femern A/S said Denmark’s National Special Crime Unit was investigating. The company said it could not provide further details while the investigation was ongoing.
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