Noah’s Island Season 3 Episode 6 The Great Wall Episode Title:The Great Wall.Episode Description:Salomi senses that Diamantina will flood again, so Noah orders Sacha to spread the word of the next flood. Rocco and Gertie plan to build a rock wall in front of their cave's entrance to protect the animals from the flood, while Noah and Nab struggle to find enough lava stones to fuel the Fire-Bowl. When Noah finds out what Rocco is planning he sets out to stop the wall from being built and convince Rocco that the wall won't protect them.