Desperate rescue efforts failed to pull the men to safety after the earlier rescue of eight subcontractors.
Rescuers prepare to go inside the shaft
The nine men were burned alive with high temperatures and dense smoke preventing them being freed.
The workers got trapped underground with fire blocking exit inside the forth shaft of Uralkaliy mine that produces potassium-rich salt potash.
There were seventeen workers cementing the shaft as the emergency situation began. Eight other men were rescued unharmed.
Archeologists discovered a new stone bracelet, two sharp pins, a marble ring and fox tooth pendants.
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