The second pilot Prototype 2 is composed of more than 350 metal components of 2 mm thickness. The major difference is that Prototype 2 components are off different size and geometry. It was assembled and launched during the field research in October 2017. Because of the material thickness Prototype 2 connections have more stable bonds between its elements.

The design of both prototypes mimics the geometry of natural coral reefs. Especially fractal growth, a pattern in nature with finite iterated replications of the same geometry at a different scale can be found in several species of stone corals.