. ▁The ▁second ▁half ▁of ▁the ▁series ▁premier ed ▁on ▁ 2 9 ▁May ▁ 2 0 1 5 . ▁ ▁Series ▁ 3 ▁( 2 0 1 6 ) ▁ ▁When ▁a ▁Chinese ▁mer ma id ▁named ▁We il an ▁accident ally ▁releases ▁a ▁water ▁drag on ▁from ▁an ▁ancient ▁re lic , ▁she ▁fle es ▁to ▁M ako ▁Island ▁with ▁the ▁creature ▁in ▁purs uit . ▁Mer ma ids ▁O nd ina ▁and ▁M im mi ▁must ▁defend ▁M ako ▁Island ▁and ▁the ▁Gold ▁Coast ▁from ▁destruction . ▁Series ▁three ▁deb uted ▁in ▁Australia ▁on ▁ 1 5 ▁May ▁ 2 0 1 6 ▁on ▁Ele ven ▁and ▁was ▁released ▁on ▁Net fli x ▁on ▁ 2 7 ▁May ▁ 2 0 1 6 . ▁It ▁features ▁ 1 6 ▁half - hour ▁episodes . ▁ ▁Car iba ▁He ine ▁guest ▁stars ▁in ▁the ▁final ▁two ▁episodes , ▁repr ising ▁her ▁role ▁from ▁H 2 O : ▁Just ▁Add ▁Water ▁as ▁R ik ki ▁Ch ad wick . ▁ ▁References ▁ ▁External ▁links ▁▁ ▁E pisode ▁guide ▁at ▁the ▁Internet ▁Movie ▁Database ▁ ▁E pisode ▁guide ▁at ▁TV . com ▁ ▁M ako : ▁Island ▁of ▁Sec rets ▁List ▁Category : List s ▁of ▁Australian ▁children ' s ▁television ▁series ▁episodes ▁Category : List s ▁of ▁Australian ▁drama ▁television ▁series ▁episodes ▁Category : List s ▁of ▁fant asy ▁television ▁series ▁episodes <0x0A> </s> ▁was ▁a ▁city ▁located ▁in ▁eastern ▁Sh iz u oka ▁Pref ect ure . ▁On ▁November ▁ 1