Something that has been gnawing at me about this whole mining accident- why did the rescuers have to look for them? Isn’t there some way to equip every miner with some sort of signalling device that would track their movements in mine? You walk into the mine, you put one on.
No more looking for survivors (should there be any), because you know where they are.
*** Update ***
And if this is not technically possible, why not just pre-position supplies every 150 yards in the mine? You know- a big box of masks and batteries and potable water.