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< p > an adventurous couple to convince their friends to explore in northern Australia in the forest ever step into a cave system.Suddenly the storm, we decided to enter the underground caves asylum.Don t want to flood rushed into the cave, oxygen content decreased gradually, everyone was trapped in a completely unknown environment.They did not expect is that moist air and the water level rising just this journey is the challenge of the smallest, the floods have brought the most dangerous predators: a group of dangerous and hungry crocodile.When danger heats up, each other between the group of friends to hide secrets be revealed gradually, they quarrel fight, betray each other, just to survive in this danger < / p >