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They are superheroes. And, after all, it is a cartoon.
(Mermaid Man is a male mermaid, or merman, and Barnacle Boy is a barnacle, and they are normally underwater.)

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14y ago
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12y ago

they have breath tubes and the director edits it so it wouldn't be there ! dugh !

No, actually they have to hold their breath but they have crew divers with them that help them.

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6y ago

They're actors, recruited to have decent swimming experience. That, including good editing, maintains the illusion.

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9y ago

Any time they touch water, they turn. Buy usually they enjoy transforming at the beach during the night when no one is watching.

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Q: How can the mermaids from h2o just add water hold there breath?
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