Meet Grace Cheatley.
She’s just a regular gal from Victoria who, when she saw a fellow Aussie in trouble, decided she would offer to help.

In doing so, she's become the country's newest hero. So much so, Prime Minister Malcolm Turnbull has announced she'll be the new face of a just-announced $15 bill.
(Okay, so I made that last part up... but we're so moved by Grace's actions, we're willing to start up a bit of a campaign.)