Terra, Locke, and Edgar travel from Figaro Castle to the Returner Hideout and pass through the cave to the town. Later, Locke and Celes pass through the cave when heading from South Figaro to Narshe. This time, they must fight the Tunnel Armor. After dispatching the machine, they make it safely out of the cave and continue to Narshe.
After the end of the world, the Crimson Robbers reveal a new section of the cave dug by sandworms. This part of the cave leads into the prison of Figaro Castle, which has been trapped underground when the burrowing engines malfunctioned. Siegfried is found following the robbers to steal treasure along the way. The new section of the cave is accessed by jumping on a turtle to traverse the cave's recovery spring, which has lost its healing properties.
Locke has come to South Figaro to disrupt the Empire's occupation. Trapped under watchful Imperial eyes, he finds an unlikely ally in Celes, an Imperial general. Together they escape through the cave beneath the town.