Lorraine Markus Dirienzo

The special examines the motives behind and analysis of the shocking attacks that took place Friday in Oslo and on the nearby island of Utoya. Anders Behring Breivik, a 32-year-old Norwegian, is accused of perpetrating the twin attacks, in which 76 people died.

Best-selling author Whitley Strieber revisits the site of his traumatic alien encounter for the first time in several decades.

Shark cinematographers Andy Casagrande and Dickie Chivell travel to South Africa on a mission to capture the largest breaching great white shark ever recorded.

After a surfer dies off Morro Bay, Calif., on Christmas Eve, shark attack investigators Ralph Collier and Brandon McMillan use forensic evidence and eyewitness accounts to identify the suspected killer: an 18-foot great white.

The special examines the motives behind and analysis of the shocking attacks that took place Friday in Oslo and on the nearby island of Utoya. Anders Behring Breivik, a 32-year-old Norwegian, is accused of perpetrating the twin attacks, in which 76 people died.

Best-selling author Whitley Strieber revisits the site of his traumatic alien encounter for the first time in several decades.

Shark cinematographers Andy Casagrande and Dickie Chivell travel to South Africa on a mission to capture the largest breaching great white shark ever recorded.

After a surfer dies off Morro Bay, Calif., on Christmas Eve, shark attack investigators Ralph Collier and Brandon McMillan use forensic evidence and eyewitness accounts to identify the suspected killer: an 18-foot great white.