Brunner Mine disaster
1896 CE.
Shown on the map at -42.432°, 171.323°.
On 26 March 1896, an explosion deep in the Brunner Mine, New Zealand, killed all 65 miners below ground. The Brunner Mine disaster is the deadliest mining disaster in New Zealand's history. The Royal Commission of Inquiry put the cause of the disaster as a blown-out shot in a part of the mine where miners should not have been working. However, experienced miners claimed the explosion was caused by firedamp igniting, which had accumulated in the mine due to inadequate ventilation.
Text from the Wikipedia article Brunner Mine disaster, licensed CC BY-SA 4.0.