Plot

When Evie's dad decides to take tourists on dive charters to Mako Island, the gang must find a way to change his mind.

Evie discovers that her father Doug has decided to branch out with his tourist diving charter... to Mako Island. Erik asks Zac to hang out since they both know each other's secrets now. Evie tells the gang about her father's new diving destination and the girls are not happy, especially Ondina. When the air compressor on Doug's boat suddenly breaks, Zac suspects Ondina. After learning that she was trapped in the Moon Pool with Sirena and Mimmi, Zac figures out who the culprit really was.—grrlpunk

Evie discovers her dad has decided to branch out with his tourist diving charter to Mako Island. Erik asks Zac to hang out since they now know each other's secret. When the air compressor on Doug's boat suddenly breaks, Zac suspects Ondina.—grrlpunk

When Evie's dad decides to take tourists on dive charters to Mako Island, the gang must find a way to change his mind. Ondina is disappointed in Erik for not supporting her belief that people must be kept away from Mako Island at all cost. Not sharing the same connection to the island as the mermaid pod, Erik thinks the easiest solution for the girls is to just avoid the island and find a new home. Zac wrongly accuses Ondina of sabotaging Evie's father's boat before catching the real culprit in the act. A solution is found when Mimmi's familiarity with sea life allows Evie's father to shift to running whale watching tours.