Aron Ralston had set out for a carefree desert hike through Blue John Canyon in Southeastern Utah when, with no warning, he had descended into hell. The young man's arm was trapped by an 800-pound boulder and he was forced to make an unimaginable decision in order to survive.

A report on Hurricane Ivan; a speck of DNA may provide clues to the murder mystery of seven people in a Chicago fast-food restaurant years ago

The first in the series aired in November 2004 as a Dateline NBC segment called Dangerous Web. The operation was set up in a home in Long Island, NY, to which 18 men came over two-and-a-half days after making an appointment for sex with a minor. One of the men in the investigation was a New York City firefighter, who was later fired by the FDNY.