Cave expert: Why Thai rescue is colossally toughGetting trapped people out of a flooded cave can be one of the easiest -- or one of the most challenging -- types of cave rescue. It is one that an international team is facing with the discovery of a group of 12 boys and their soccer coach -- missing for nine days -- alive, and basically well, in a cave in Thailand. They had gone into the cave after soccer practice and rising flood waters prevented them from leaving.

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Cave expert: Why Thai rescue is colossally tough