As Rescue Ends in Tragedy, Codelco Asks Experts What Went Wrong

After six deaths at its biggest mine, Chile’s state-owned copper giant Codelco will now examine what caused Chile’s deadliest mining accident in decades — and how it can prevent another tragedy.

A frantic weekend rescue mission recovered the bodies of all five workers still missing since Thursday, when seismic activity caused a tunnel collapse at one of the world’s biggest underground copper mines.