Factual error: The author says that Rachel and Michael (as well as Corky) are rescued by a Coast Guard MV-22 Osprey. The Coast Guard does not fly Ospreys.
In the danish version of the book, when Norah is examining the water sample from the hole in the ice, she concludes that it is a 3% saline solution, and shortly after, they're talking about it being a 4% solution.
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