1D Just Add Water (H2O)

Best friends Eleanor, Perrie, Danielle and Shaylah go on vacation to Australia and go exploring. They go for a ride on a motor boat but get stranded when they run out of gas. The only land they see is a strange island so they row to it. They find a cave with a little pool and jump in. Something magical happens and the next day they find out they're mermaids. They meet One Direction and other people on the way. Who are they? You have to keep reading to find out.