Tomorrow marks a year since the Gleision Colliery disaster in which four men died.
First Minister Carwyn Jones says lessons must be learned to make sure an incident like it doesn't happen again.
Saturday marks the one year anniversary of the Gleision mining disaster
Tomorrow marks a year since the Gleision mining disaster, and the First Minister has led the tributes to the four men who lost their lives.
Almost a year on from the Gleision Colliery disaster, we're looking back at the events of that day and speaking to some of those involved.