Mako: Island of Secrets (2013)

S1E10 Zac Returns to Mako

Disregarding Nixie and Sirena's warnings, Lyla decides to accompany Zac to Mako Island. In a daring move, she swipes Rita's Moon Ring to unlock the land entrance. However, chaos ensues when the entrance unexpectedly shuts, leaving both Zac and Lyla stuck inside.