47° 22′ 18.26″ N, 8° 32′ 32.14″ E
Testing dive logistics in a Swiss lake

Before we went to Colombia to build our very first coral reef, we tested the whole process in our home lake – in Zurich – in May 2021. It was a cold spring, and the water was 8°C cold. You can clearly see that in our faces in the video below. But it had to be done. This test was essential to the whole process, because we used a custom made concrete foundation to anchor our reef bricks to the ground. Both preparing the concrete pieces, and diving them down to the ground were not trivial, and we actually made e few changes to the process before repeating it with a much bigger reef in Colombia.

Pieces from our Zurich lake test reef now have a second life at the “Institut auf dem Rosenberg”, where they serve an educational and esthetic purpose in the Climate Garden of this international private school.