i don't know what would go through my mind if i was trapped in a situation like that. if i started out and i saw that there had been an explosion and i was crossing over debris, we had to get these miners, i guess, the opportunity to go somewhere else if they did not feel they could make it out of the mine, and they could have made it to that refuge chamber. as ron mentioned, that's our hope. and i mean, that's what we got left to go after right now. we know they didn't come out, so the next option would be for them to go to that refuge chamber. >> just to be clear, you're talking about six out of nine, so we're talking about maybe three unaccounted for miners right now. what about the fourth, which i know you think is in a different place but is there debris in front of where you expect that minor to be, you characterize the obstacles to getting to the area you want to check on there? >> we have investigated that area one time previously. that would be considered the