The deep sea is the last, vast wilderness on the planet. This is the story of how we imagine, explore and exploit it.

For centuries, myth-makers and storytellers have concocted imaginary monsters of the deep, and now scientists are looking there to find bizarre, unknown species, chemicals to make new medicines, and to gain a greater understanding of how this world of ours works. With an average depth of 12,000 feet and chasms that plunge much deeper, it forms a frontier for new discoveries.

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An impassioned examination of the existential threats to the world's ocean and cautious optimism for the abundant life within it.