Locked inside a hollow metal sphere dangling on a cable, two men are about to plunge into the absolute unknown. It is the summer of 1930, and engineer Otis Barton and explorer Will Beebe are determined to see the deep ocean with their own eyes. They know the risks are immense. A single tiny leak in their homemade Bathysphere could send highly pressurized water shooting through them. One errant spark could ignite their oxygen tanks. Despite the terrifying dangers, Otis and Will take the plunge, becoming the first humans to dive lower than a few hundred feet into the pitch-black abyss. This spine-tingling true story places readers right inside the cramped, freezing Bathysphere as the two pioneers descend into the dark waters. It is an unforgettable tale of engineering, bravery, and the relentless human desire to explore the unseen corners of our incredible planet.