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https://envirowatchrangitikei.wordpress.com/2020/11/22/less-than-1-year-after-the-pike-river-mine-explosion-tonnes-of-concrete-were-poured-into-a-critically-important-air-feed-where-miners-could-have-gathered-engineer/
Less than 1 year after the Pike River mine explosion, tonnes of concrete were poured into a 'critically important' air feed where miners could have gathered (Engineer)