Scientists found the head of a 330-million-year-old shark in a Kentucky cave

Christmas celebrations, haze over Sydney and an ancient cave: World in Photos

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Armie Hammer Ascends From an Underground Cave | Running Wild With Bear Grylls

Catch of the Week: Anchor Anger | Wicked Tuna

Life Beyond Earth, Part 4: Penelope Boston | Nat Geo Live

Exorcism in India | National Geographic

Authorities in deciding how to rescue soccer team from flooded cave in Thailand

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5 men rescued from Virginia cave after hours being trapped

Rescue teams save 5 men trapped in flooded 'cyclops' cave

New video shows dramatic moments of Tennessee cave rescue

Diver describes rescuing man who helped rescue Thai cave boys

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