Martinair Flight 495 is seconds from landing at Portugal's Faro Airport when the storm it's flying through takes a sudden turn for the worse. On touchdown, the DC-10 erupts in flames and tears apart as it slides more than 350 feet off the runway. Miraculously, most of the 340 passengers and crew survive the crash, but 56 people are killed, and investigators need to determine the cause of the accident. Bad weather appears to be the main culprit, but the discovery of a two-inch deep cut down the runway raises troubling new questions.