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Everyone on the other side of the explosion and whatever collapse exist cysted would be on the other side. is it possible an hour and 15 minutes later they might not even know what's going on on the other side of the collapse. >> no. it's possible they don't know because, like i said, they have been cut off from the entrance they don't know exactly how many people were in which areas after the explosion. they don't know how much of the tunnels caved in or drifts caved. in they don't know how much actually got to the rescue modules before there was too much of a hazard for them. >> shepard: a l...

Leaders person? do you have to be carrying them around or what's the rule. >> they would have to be located in the working sections. if it's in a section where they are not mining coal, it may not be an area where set up. they would have to some v. some type of a wireless system set up. usually the supervisors have direct access to it. sometimes it's connected right into their regular wired system where all the miners would have access to it. plus, the rescue modules that are in the mine itself would have the access to the wireless systems. >> again, mind safety expert on the dial with us afte...