A journey to the bottom of the sea, beginning before the conformation of the Earth had been fully defined and just as the so-called “new dawn” was about to introduce a new entry: the mammal. Against a background of the geological and climatic changes at the advent of the Eocene age, this documentary follows the evolution of the seas and oceans to uncover spectacular and wonderful places, guardians of the origins of life. A past that is often beyond our imagination, but the knowledge of which will help us appreciate the wonders of our world more fully.