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To: Hawkmoon who wrote (68477)	11/21/2010 7:24:50 PM
From: Maurice Winn	1 Recommendation Respond to of 218068

2 km to crawl out is not a huge distance, even wounded, over 3 days and I suppose the tunnel is small enough to not go around in circles. So it would be doable if not too badly injured. As I explained to our 5 year old grandson, showing him the cross section of the tunnel system, being inside the tunnel was like being inside a gun barrel, but on the breech side for those missing presumed dead. The two on the outside of the blast got the same pressure wave by the look of it, and survived sufficiently to walk after some recovery from the shock. <And from what I read, the overpressure from that blast makes it unlikely that anyone survived. If they had, they'd be crawling out right now> As you know, explosions range from low pressure fast burn to super high pressure shock waves. Since two in the tunnel survived, it seems a good chance that the pressure at the other end was survivable too. If the vents are open, then convection would refresh the air near enough for government work over a half hour or so. Cold air in the bottom, hot air out the chimney. My guess is many of the miners have died of dehydration and delay rather than being crushed with organ failure. < from what I read, the overpressure from that blast makes it unlikely that anyone survived. If they had, they'd be crawling out right now. > They did survive, they did crawl out. But they didn't have to go very far to get out. Those further in have a tougher job and being at the breech end of the mine shaft, they would have got more pressure, though they were further up the mine than the ventilation shaft which took some of the pressure off as shown by the smoke around it resulting from the blast coming out there. Some indication of the amount of pressure is shown by the damage to the outlet from the vent with parts blown outwards, but not dramatically so. It was not such huge pressure. Mqurice