What makes a river bad? People? Well, Beau Miles is one human who explores bad rivers and—especially in the case of Cooks Rivers—attempts to make them less bad. It might not be something a single person can achieve but if someone can get even remotely close to it by himself, it’s Beau.

In this documentary, Beau kayaks the Cooks River in Sydney, Australia’s sickest urban river. “Finding it not only challenging, but shocking in terms of its ill health, I’ve since shifted from wanting to see the wildest and most pristine places on earth, to the most degraded and sick. This is a journey of ill-health, sadness, and hope; putting a test to the local saying, ‘if you fall in, you’ll dissolve.'”