``Isolated group
The trapped group of miners tried to escape through a ventilation shaft system but the ladders required by mining safety codes were missing and the shaft later became unusable during subsequent geological movements.[20] The company had previously been ordered by supervisory authorities to install ladders as a condition of restarting operations, after an earlier accident had caused authorities to close the historically accident-plagued mine.[12]
The shift supervisor of the trapped miners, Luis Urzúa, recognizing the gravity of the situation and the difficulty of any rescue attempt, if a rescue was even possible, gathered his men in a secure room called a "refuge" and organized the men and meager resources for long-term survival. Experienced miners were sent out to assess the situation, men with important skills were given key roles, and numerous other measures were taken to ensure the survival of the men during a long-term entrapment.[citation needed]''
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