Was the Pike River mine safe? Were there really two exits, or was there just one, plus a 100m ventilation shaft with a ladder?
And eight months after the explosion that claimed 29 lives, where does the buck stop?
Or was it just an appalling accident, with no-one directly to blame?
Those are the issues being raised at the royal commission into the Pike River mining disaster.
John Campbell discusses them with Pike's CEO, Peter Whittall - but first, a reminder of the West Coast, how it works and the black stuff at the heart of this story - coal.
Watch the video.