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" Di Rosa said that they have five or six deaths in the refuge every year . Octopuses and their relatives have been on Earth for almost 400 million years , but very few humans come across them . His fatigue was so severe that he had slept through a driving hailstorm . His injuries were sobering : severely pulled muscles in his shoulder , ligament and cartilage damage in his knees , and two sprained ankles . " Well , " he said , and looked through the darkness of the room to see with astonishment the changed face of his son .