Plot: The sportswoman Sarah loses her husband and daughter in a car crash, but she survives. One year later, her friends Beth, Rebecca, Sam and Holly, leaded by Juno, invite her to explore a deep cave in the mountains. When the expedition is about three kilometers underground, a rock collapses and blocks the access tunnel, trapping the group inside the cave. With limited supplies, they try to find a way out, but sooner they face a hunger and savage breed of predators.
Alternative Plot: Scientists embark on a mission to the Earth's core to save the planet from worsening quakes and volcanic eruptions.
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