Alanna Mitchell provides an enthralling adventure story as she exposes the growing crisis beneath the waves and its implications for the future of life on the planet.

The global ocean makes up 99% of the living space on the planet. If you total all of the land’s surface and the narrow band of air that supports creatures who breathe air, it is just one percent of where life can survive on the planet. The rest is in the ocean. 

What is significant is how deep the ocean goes. That total volume, with its immense biological importance, is what author Alanna Mitchell came to think of as the deeps, the third dimension, the source of all life. 

Traveling around the world—from Australia’s Great Barrier Reef to the Gulf of Mexico, China and Zanzibar—Alanna Mitchell reveals the growing crisis beneath the waves and its implications for the future of life on the planet.