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Unabridged — 12 hours, 59 minutes

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Overview

What was Amelia Earhart*carrying on her final flight? The adventure begins two thousand feet beneath the surface of the Earth.

Philip Mercer, a preeminent geologist with a taste for international intrigue and danger, rides an elevator two thousand feet into the earth at the Leister Deep Mine in Minnesota. Mercer is there to visit his old friend and mentor, Abraham Jacobs, who is leading a research team to the deepest section of the mine for a groundbreaking study on climate change. But as Me...