Emil Nobel (1843-1864) was the youngest son of Immanuel Nobel and the youngest brother of Robert Nobel, Ludvig Nobel and Alfred Nobel. He died at an explosion on 3 September 1864 in his father's factory Heleneborg in Stockholm. As said from a documentary about Alfred Nobel, aired on the Discovery Channel and the Science Channel, the explosion was caused by Alfred's nitroglycerine. Before discovering how to make dynamite, Alfred used unstable nitroglycerine, which was highly explosive and needed to be shipped with precaution. While Alfred left, Emil had an incident, causing the nitroglycerine to explode.