American athlete Erik Weihenmayer is blind but he has never let it slow him down. In 2001, he became the first blind person to climb the summit of Mt. Everest, for which he was honored with a TIME Magazine cover story. Leading a movement to help people face challenges, he sets up an even more formidable goal, involving leaving his family behind to kayak the violent whitewaters of the Grand Canyon’s Colorado River with nothing but the voice of his guide, Harlan, to keep him alive. In The Weight of Water director Michael Brown masterfully captures Erik's deep preparation, meticulous precision, and growing fear as the rapids ramp up each day. Accompanied by trip-mate Lonnie, another blind kayaker, they will have to ultimately learn from each other and from the powerful waters as they face Lava Falls, the toughest stretch of rapids in the canyon.