Overview
- Five workers were killed in a methane explosion at the Cerredo mine on March 31, with several others injured.
- A survivor told Guardia Civil his gas meter was already alarming and showing an X for more than 5% methane just before he saw a fireball and the blast.
- A rescue brigade member reported finding an MSA ALTAIR 4X detector at the scene switched off and missing its clip, noting such devices must stay on underground.
- Witnesses said coal had been removed daily without a permit for one to two months—estimated at up to about 60 tonnes a day—and recalled earlier ventilation problems that caused dizziness.
- Other employees testified that gas measurements were always carried out with no prior incidents, as the judge and Guardia Civil continue collecting statements and physical evidence.