Water covers almost three-quarters of the planet, yet its mystery and magnificence remain almost entirely unexplored. While we are inexplicably drawn to the water, our ocean depths are guarded by conditions that make space travel seem trivial by comparison. Inspired by the true account of the first underwater explorers to make it to Challenger Deep, 11 km straight down, WaterFall is the story of a team of scientists who endeavour to be among the very few who have braved the deepest place on earth.