Nixie agrees to help Cam unlock the trident but Evie wants to come along for the dive. When at Mako Cam gets the trident and starts swimming away leaving Evie behind because Nixies moon ring ran out of power the cave and chamber entrance shut and evie is trapped. Just when Evie is about to run out of air Zac and Lyla appear and help her out. She learns About Zac, The Mermaids and The Trident. What she didnt know is that Cam wants the trident for himself.