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What do you see, hear and experience when you drop miles into the deepest parts of the ocean?

For journalist Susan Casey, it was transformative — even emotional. Her latest book, “The Underworld,” is a homage to the abyss and the scientists who explore it.

She also describes her own dives in deep-sea submersibles, through the oceanic “

,” which is rich with bioluminescent creatures, down to depths of 5,000 meters, where utter darkness still teems with life. 

Casey joined MPR News host Kerri Miller on this week’s Big Books and Bold Ideas to share stories about her dives and what she experienced in the abyss. She also talked about how the deep submersible community reacted to 

the tragic end of the Oceangate Titan sub

 last summer (“people were watching the creation of that sub with real fear”) and warns of the growing interest in deep sea mining.

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Journalist Susan Casey descended to some of the deepest parts of the ocean in tiny submersibles while researching her new book, “The Underworld.” What she saw is astounding.

What the deepest ocean reveals and how to save it

Go Deeper.

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