The professor found an underground sea., true, false, Axel could move normally during the first two days., true, false, There was light under the Earth because of electricity from the rocks., True, false, They travelled across the sea by boat., true, false, Hans threw the pickaxe into the water to check how deep the sea was., true, false, The pickaxe touched the bottom of the sea., true, false, There were marks on the metal head of the pickaxe., true, false, They saw only one strange animal in the sea., true, false

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