"Steel Algae"

Although in the past fifteen minutes, they never met any dangers aside from poisonous plants or all sorts of carnivorous plants that the plant-tamer girl diligently solved... 

But they were still a bit nervous when they saw the outline of the Acacia plant's roots. 

From afar, they could only see huge black roots as big as the steel used in many buildings, and to be honest, even from afar, looking at such a neat row of roots... 

Everyone felt like entering an underwater forest made entirely with acacia roots! 

Even the adults here looked so small compared to the roots as if they could directly make a house inside these roots or in the gap among the roots. 

They knew that they should have arrived near the 'wall' of the west lake, which means they were close to the shore, but because they were deep underwater, all they saw was a long and tall wall of stone with all those roots.