On July 22, 2011, a gunman goes on a terrorist rampage – starting with an explosion in Oslo and ending with the slaughter of dozens of teenagers.

On November 18, 1978, when enigmatic cult leader Reverend Jim Jones calls all his followers together in South America, the resulting tragedy becomes the largest mass murder-suicide of US citizens in history - 909 are dead.

On October 3–4, 1993, what should have been a simple snatch and grab operation for the US Army in Somalia turns into a battle that kills 18 US Rangers and around 1,000 Somali civilians.

On May 10–11, 1996 saw the death of nine climbers, including New Zealand climbing veteran Rob Hall. Was it a fierce storm, extreme ambition or something else that caused their demise?

On August 12, 1985, the rear pressure bulkhead burst on Japan Airlines Flight 123, destroying the vertical stabilizer and severing all four of the aircraft's vital hydraulic systems. The crew kept the aircraft flying for 32 minutes until it clipped Mt Osutaka and crashed, killing all but 4 people out of the 524 passengers and crew aboard.

On April 25, 2005, a seven-car commuter train came off the tracks and crashed just before Amagasaki Station in Japan causing 107 deaths and 562 injuries.

On August 9, 1945, the United States of America, during the final stages of World War II in 1945 bombed the Japanese cities of Hiroshima and Nagasaki causing a huge death toll.

On May 25, 1982, in the Falklands War between the United Kingdom and Argentina a low level bomb attack from the Argentinian jets capsizes the HMS Coventry within 20 minutes - why did the ship sink so quickly?

On August 6, 2011, a U.S. Boeing CH-47 Chinook was shot down while transporting a quick reaction force attempting to reinforce an engaged unit of Army Rangers in Wardak province, west of Kabul, Afghanistan. The resulting crash killed all 38 people on board.