Der Leuchtturm Créac’h steht vor einer technischen Modernisierung, um sein Quecksilber-Rotationssystem zu ersetzen, ohne das Leuchtfeuer zu verdunkeln.

Operational brief: maintaining maritime signalling during decontamination

The Créac’h lighthouse on Ushant features a double Fresnel lens weighing 17 tonnes whose rotation has historically relied on a mercury bath. The Direction Interrégionale de la Mer (DIRM NAMO), together with Pôle Mer Bretagne Atlantique, has launched an expression-of-interest (AMI) open from 22 December 2025 to 22 March 2026 to identify solutions that will remove the toxic mercury while ensuring continuous maritime signalling and protecting the listed heritage fabric.

Heritage constraints and engineering parameters

The site is officially listed, so any intervention must preserve the lens in its present state, respect original mechanisms, and guarantee the stability and regularity of optical rotation. The operational requirement is clear: replacement solutions must be technically feasible without interrupting the lighthouse’s service for shipping in the Iroise Sea. That imposes narrow windows for on-site works and rigorous risk management in logistics, transport of materials, and temporary signalling alternatives.

Why this is more complex than other removals

Previous mercury extraction projects in the French network—carried out at several locations—have simplified reuse of modern bearings or full replacement of the drive. At Créac’h, the mass of the optics, the integrity of the supporting structure and the touristic value of an intact historic mechanism raise the bar. Engineers must balance preservation, operational continuity und environmental safety.

Who is being invited to contribute?

The AMI explicitly calls for contributions from a broad spectrum: engineers, architects, maritime technicians, heritage specialists, industrial partners, universities and research centres. Practical knowledge from lighthouse keepers and sailors who maintain these granite towers is also solicited, underlining the project’s cross-disciplinary nature.

• Technical teams: bearing and drive designers, mechatronics specialists
• Conservation experts: heritage architects and lens conservators
• Operational partners: port authorities, navigation safety services
• Industrial suppliers: companies able to prototype bespoke solutions

Potential technical pathways

Respondents have proposed a range of approaches, alone or in combination. The AMI encourages creative hybrids that reconcile tradition with modern engineering.

• Mechanical adaptation: custom bearings and counterweights to reproduce original rotation characteristics
• Bearing innovation: sealed, low-friction bearings that remove the need for a liquid bath
• Partial automation: inserting modern servo systems while retaining manual override and visual authenticity
• Hybrid solutions: preserving the original drive for display while a concealed modern mechanism handles live rotation

Logistics, timing and evaluation criteria

Submissions will be judged on technical feasibility, compliance with heritage constraints, and the capacity to assure uninterrupted maritime service. Given the active navigation lanes around Ushant, proposals must incorporate transport plans for heavy components, on-site staging and contingency signalling, as well as safe mercury extraction and disposal procedures where relevant.

Implications for visitors and local tourism

Créac’h is not only a navigation aid; it is a cultural landmark that draws visitors and contributes to Ushant’s identity as a maritime destination. Any modernization that maintains the lens and the look of the mechanism will help preserve guided visits, museum-style interpretation and coastal walks that form part of the island’s travel experiences.

The technical call is therefore an opportunity to protect both navigation safety and the visitor experience. While engineering teams tackle bearings and drives, tour operators and heritage bodies should plan for visitor-safety measures and interpretive activities that can run alongside phased works.

At a glance, this collective effort links engineering, conservation and local tourism: a successful implementation could become a template for other lighthouses still using mercury, and an attractive story for Museum tours with live guides and eco-conscious travellers visiting Ushant.

Expert assessment panels expect submissions by 22 March 2026. Proposers are advised to include detailed timelines, logistical plans for transporting heavy optics and contingency schemes to avoid any darkening of the light during works.

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In summary, the Créac’h project demands engineering ingenuity, careful logistics and sensitive heritage handling to remove mercury while keeping the beacon alive. Its outcome will influence navigation safety solutions and local travel experiences alike, from Adventure activities and Luxury adventure travel experiences to Museum tours with live guides and Online virtual tours. Prospective contributors should address operational continuity, environmental safety and visitor impact; the project pairs technical innovation with tourism potential—making it a pilot for eco-friendly wildlife safaris of engineering, Exclusive yacht charters for events nearby, Cruise packages that pass Ushant, Adventure rafting trips for beginners in regional waters, Interactive online cultural workshops about lighthouse heritage, and even niche offerings such as Esports lessons or Beginner esports coaching sessions for on-island youth programs. The balance struck here will set a benchmark for future conservation-driven upgrades across maritime landmarks.