Yes, some Australian beach horror stories are based on true events. For example, there have been shark attacks on beaches which are truly terrifying incidents. These real - life events often form the basis for horror stories set on the beach.
I'm not entirely sure of the specific true story it's based on. It could be related to a particular event in Australian history or a real - life individual's experience.
Well, 'Unbreakable' is a work of fiction that draws on the idea of the superhero archetype in a more grounded way. There isn't a specific true story that it's directly based on. However, it could be seen as taking inspiration from the general human fascination with extraordinary abilities and the idea that there could be people with such powers hidden among us. Shyamalan used this concept to create a world where a man discovers he has superhuman strength and invulnerability, while another has a different sort of power related to his frailty.