Detailed text transcripts for TV channel - CNN - 20100408:23:41:00
Apparently this mine doesn't use it. of course the deeper you are underground, the more costly it is to drill the holes. but having those holes there really improves the ventilation. so that's an option that operators consider all the time. >> bob ferriter with the colorado school of mines, a health and safety specialist. bob, thanks for your insights tonight. before we go to break, i want to foe to the magic wall and illustrate the point bob was making. here's a layout of the mine here. where the circle is, this is where the explosion took place. you can see the miners have been recovered. th...
Source: news source