Horrifying moment 'mermaid' passes out underwater in aquarium

This is the terrifying moment a mermaid performer passes out underwater and sinks apparently lifeless to the bottom in front of an audience of horrified children.

The performer, wearing a mermaid tail, appears to convulse underwater and makes no effort to return to the surface.

It later emerged that the audience first mistook the drama as part of the performance but quickly realised something was wrong and called for help after about 20 seconds.

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