From a house in Hamburg to a volcano in Iceland, then straight down. Scroll to follow Professor Hardwigg, Harry and Hans through the Earth.
Overland and by seaUnderground, a guess at their path
Each stop is a real moment from the book. Tap Listen to start that chapter.

A shadow on the crater floor shows which chimney to take.
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The Hansbach stream saves them. The sea is somewhere above.
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In an ancient forest, something huge moves among mastodons.
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His initials, carved in the rock. They are on the right path.
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