The students collaborated with Ms McDiarmid to create the spectacle and banded together to become props, such as waka and the whale.
Event manager Sarah-Jane Phillips said Whangarei Intermediate captivated the audience with their performance.
"Watching the story we all know and love come to life was amazing," said design judge Gayle Dowsett.
"The way they created their sets was thrilling ... clearly well-rehearsed and a lot of effort has been put into it, as it looked incredible."
Whangarei Boys' High School placed second in the competition with their comedy performance about the struggle men go through to find love.
Head of drama at Boys' High Robert Pollock said the students provided the crowd with some light-hearted relief and were delighted to finish second.
Whangarei Girls' High School finished a close third with their performance My Tender Thoughts.