Kevin McGrath is depressed, overweight, and chasing one goal before he lets either one win: swimming face to face with a great white shark. He shoots the whole attempt himself on a home video camera, with no crew and no studio behind it, turning the project into both a personal dare and a piece of evidence that depression can be worked through rather than simply endured. The film follows his preparation and the logistics of getting into open water with one of the ocean's most feared predators, but the shark dive is really the frame for a more direct conversation about mental health, addressed straight to camera at points, aimed at viewers who have lost someone to suicide or are struggling themselves. McGrath is explicit that this is not meant as an adventure thriller; the risk in the water stands in for the risk he took by staying alive long enough to get there. It ends less as a nature film than as one man's argument, made in public, that a dream can double as a reason to keep going.