Under the Mountain (2009)

Teenage twins, Rachel and Theo, find themselves drawn into a shadowy realm lurking beneath Auckland's volcanic landscape. As they uncover ancient secrets, they must confront sinister forces threatening their city and possibly the world. With a mix of adventure and supernatural elements, the siblings navigate a perilous journey filled with unexpected allies and dangerous foes. Their bond is tested as they harness their unique abilities to protect their home, ultimately facing a climactic showdown against the darkness that seeks to consume everything they hold dear.