Hōjō Coal Mine Disaster
1914 CE.
Shown on the map at 33.683°, 130.791°.
The Mitsubishi Hōjō mine disaster occurred December 15, 1914, in Kyushu, Japan. A gas explosion at the Hōjō (Hojyo) coal mine killed 687. It is the worst mining accident in Japanese history.
Text from the Wikipedia article Hōjō Coal Mine Disaster, licensed CC BY-SA 4.0.