3D-Printed Artificial Reefs Bring Marine Life Back to Danish Ports
Introduction
In early September 2025, Danish port authorities launched an environmental initiative aimed at reviving marine ecosystems inside harbors. The plan involves installing 3D-printed artificial reef units along submerged quay walls, responding to decades of biodiversity loss and encouraging the return of fish and other organisms once common in these waters.
Technology and Materials
Each unit is produced with low-carbon concrete, blended local aggregates, and crushed mussel shells to create a rough texture that helps marine larvae attach and grow.
The design imitates natural reefs through small cavities and perforations, offering safe micro-habitats and supporting the early stages of an aquatic food chain.
Implementation Sites
- Aarhus Port
- Korsør Port
- Helsingør Port
- Sprogø Port
- Fredericia Port
On 20 August 2025, the Port of Copenhagen also began installing its first reef units as part of a wider rollout.
Early Results
- Algae and mussels appeared within just a few months of installation.
- Small fish soon followed, and later larger species such as cod and eel, particularly in Fredericia.
- The structures provide natural shelter, helping restore ecological balance without disrupting port operations.
Project Partners
- Stonereefs – lead developer and designer of the reef modules
- Cobod – 3D printing specialist supplying the BOD2 printer
- Universities and students – contributing new design concepts and monitoring reef colonization through live camera feeds
Statement
Mikkel Brich, founder of Stonereefs, noted:
“3D printing allows us to enhance biodiversity without interfering with daily port activities. Once you give nature a foothold, life returns within months.”
✦ ArchUp Editorial Insight
This project demonstrates the use of 3D-printed artificial reef units to restore marine life in Danish ports, employing low-carbon concrete and local mussel shells to provide surfaces suitable for larvae settlement. The design includes fine cavities that mimic natural reefs, fostering rapid colonization by fish and algae. Yet, while the initial outcomes are promising, questions remain regarding the long-term sustainability of the units and their integration with the local ecosystem. Nonetheless, the project provides a practical example of innovative sustainable design strategies applicable to future marine environments.
Explore the Latest Architecture Exhibitions & Conferences
ArchUp offers daily updates on top global architectural exhibitions, design conferences, and professional art and design forums.
Follow key architecture competitions, check official results, and stay informed through the latest architectural news worldwide.
ArchUp is your encyclopedic hub for discovering events and design-driven opportunities across the globe.
