Pike River Mine Re-Entered?

Three people opened the doors to the mine, checked the draft condition and came out. It's their first step in the 36 million dollar plan to explore the 2.3 km-long entry tunnel to search for clues as to what caused the mine to explode. Their previous attempt had failed because of high levels of oxygen that made it potentially unsafe to enter.

The Pike River Mine disaster was a mining accident that occurred around nine years ago on 19 November 2010. There were 31 miners at the time and only 2 miners survived. There was another explosion on 24 November. Police believed the remaining 29 men to be dead. The mine hasn't been entered since.