Seiya and Shun recover and defeat the Mariners who have arrived. Meanwhile, Poseidon takes Saori to a place where she will give humanity a chance to live, by sacrificing her life. He explains that the underwater Sanctuary has Mammoth Pillars that hold up the seven seas: the North Pacific, South Pacific, North Atlantic, South Atlantic, Indian, Arctic, and Antarctic Oceans. The Mammoth Pillar holding up the sea in its entirety is the Main breadwinner. If it is destroyed, the underwater Sanctuary will be no more...