Sleep guide

The trip across Iceland is slow and peaceful. The underground sea has calm days too. Set the 15-minute timer and drift off.

Calm for bedtime

• Chapters 6 to 10: the voyage to Iceland and the pony ride
• Chapter 22: a quiet Sunday underground
• Chapters 27 and 29: the Central Sea and a calm sail

Better by day

• Chapters 20 and 24: no water, then lost in the dark
• Chapters 30 and 32: sea monsters and a storm
• Chapters 39 to 43: the explosion and the volcano