In Kaprun, Austria, a mountain train to bring skiers up the mountain erupts in fire as it passes through a tunnel. 155 people die. The cause is an electric heater that catches fire and ignites hydraulic fluid dripping from a leaky line.
On Tenerife, a Pan Am flight taxied on the runway, while a KLM flight took off. But miscommunication caused one of the worst aviation disasters when the two jumbo jets collided, killing 583 people. The second by second analysis with interviewed survivors is covered in this episode.