From the stormy surface to the eternal darkness of the abyss, several generations of these deep-sea divers encounter men and their “toys”: harpoons of yesterday, and fishing lines of today. Once victim of whale hunting, now accused for stealing fish, a sperm whale shares its private life with us. And what an immersion! We discover in turn its mysterious sonar, its competitors like orcas, and also the strange world of its neighbours—the deep-sea monsters. Amongst them, a revelation: the biggest squid ever filmed in its natural environment: an almost 15 feet long alien. Come and pierce the impenetrable shield of the Crozet abyss…