Environmental Catastrophy
Global Warming


  • Main problem:
    Coral Bleaching
  • Subproblem:
    Species extinction
  • Consequence:
    Environmental destruction, Water temperature increase
  • Solution:
    Rebuilding coral reefs with 3D-printed bricks made of clay.

Solving the climate and biodiversity crisis is one of biggest and most urgent challenges of our times. 

We help coral reefs survive until we get there.

We are a young and innovative bi-national organization, based in Zurich and Berlin. As an ETH Spin-off, our work is grounded in science and engineering, and elevated by art and education.

rrreefs was founded in October 2020 by Marie Griesmar, Ulrike Pfreundt, and Hanna Kuhfuß, and has since grown to a core team of five.
The International Coral Reef Society states “The coming year and decade likely offer the last chance for international, regional, national, and local entities to change the trajectory of coral reefs from heading towards world-wide collapse to heading towards slow but steady recovery”.

We rebuild coral reef structure to regenerate reef life and restore coastal protection capacity. Our reefs are eco-engineered to promote the settlement and growth of young coral and increase diversity and abundance of fish and other marine organisms. Our aim is that our structures develop into self-sustaining reefs over the years, bringing back abundant marine life, protecting coastlines from erosion and flooding, and increasing the resilience of coastal communities.

The lego-like architecture of our system allows for customized reef shapes that fit into the local environment, creates habitat diversity, and diverts currents. The surface structure of each brick helps coral larvae settle and grow by interacting with water flows to transport the tiny larvae towards the substrate. It then provides them with sheltered spaces with sufficient light and protection from predators and sand settlement. The hollow bricks provide excellent habitat for smaller and juvenile fish, crustaceans, sea urchins, nudibranchs, and many other critters that find shelter in reefs.

Photo Credits by: ©rrreefs

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