Many years ago, there were 3 best friends Rikki,Cleo and Emma. When Emma was bored she asked her father if he could take them out to Mako Island, excited to go for a swim they all jumped in the moon pool water, as it got late the water started to bubble and go up to the top of the volcano. The magical energy caused all 3 girls to become mermaids by water but girl by land.
With this magical gift they all received a water changing ability. Rikki had the power of heating the water, Cleo had the power of shaping the water and Emma had the power of freezing the water. Still to this day the myths stays unknown. There has even been a modern version of a TV show based on it called H2O:Just Add Water