C720 The Mermaid's Voice

The three pillars sank into the sea, forming an equilateral triangle.

The distance between each stone pillar reached 30 kilometers, forming a huge vacuum in the sea. When the three stone pillars returned to their original positions, Chu Feng sat on the formation pattern and made some changes.

Thus, the three stone pillars radiated a total of 60 kilometers of the vacuum zone in four weeks