Experts are talking about digging a new tunnel into the Pike River mine to try find out what caused the explosion.
Families of the 29 men who died there in 2010 want answers and the chance to potentially recover their bodies.
Ventilation and geotechnical experts are in Greymouth to work out the best way to enter the mine.
Joining Ryan Bridge and Lisa Owen on RadioLIVE Drive to discuss the 3 options mooted is Dave Gawn, CEO, Pike River Recovery Agency.
Listen to the full interview with Dave Gawn above.