Do you know what lies at the bottom of the ocean? From the makers of the Walking With... series comes an enthralling exploration of Earth's final frontier seen through the eyes of the world's largest predator, the sperm whale. Following a young male from infancy to old age, the marinescape comes vividly to life: the impossibly deep canyons, the underwater volcanoes, and the spectacular mountain ranges. The inhabitants of opaque depths are no less impressive - black dragonfish that cast an eerie red glow, jellyfish shaped like giant footballs - but the whale is only interested in one creature, the colossal squid. When the two meet, it is the ocean's ultimate battle.