To turn oneself invisible

Invisibility is a power that most of the Merpeople seem to have on Mako Mermaids. The user puts their hand in a fist motion and turns invisible. It almost looks like they encase themselves in a bubble. Rita is the only mermaid that seems to be able to use her powers to see invisible merpeople by using a hand motion, as shown when she sees Zac in her office after he stole the test. 

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