It's been more than eight years since 29 men died when an underground explosion ripped through the Pike River coal mine. Families have battled authorities ever since to try to bring back their loved ones. Tomorrow experts will chip off the concrete seal to the mine's entrance and start looking for remains and clues about what happened. Kurt Bayer explores some of the big questions about re-entry.

Why has it taken this long to go back into the mine?

For the last eight years, many of the families who lost loved ones in the disaster have pushed to

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