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https://stairnaheireann.net/2019/10/23/otd-in-1958-the-springhill-mine-bump-an-underground-earthquake-traps-174-miners-in-the-no-2-colliery-at-springhill-nova-scotia-the-deepest-coal-mine-in-north-america-at-the-time-3/
#OTD in 1958 – The Springhill Mine bump: An underground earthquake traps 174 miners in the No. 2 colliery at Springhill, Nova Scotia, the deepest coal mine in North America at the time