The Mermaid's Cave is the sixth dungeon from Oracle of Ages. The mini-boss Vire appears in the present, and the boss Octogon appears in the past. Link has to travel between the past and present to fully complete it. The Mermaid Suit, which allows the wearer to dive underwater and swim in deep water, is found here in the present. Link needs the Mermaid Key to enter in the past, and the Old Mermaid Key for the present.