that s how the drillers knew they hit the hole. now, you can hit empty spaces on the way down. this is not like taking a wood drill bit and drilling through a 4 by 4 and having a nice smooth hole. let me show you what this hole looks like, all the way down there are different sand stones. there s quartz, there s granit. so the roughness and the rocks that are following out and falling down on those men right now, they re probably not even in that room. the air is probably not even breathable for them right now considering all the dust that s down there. as all this stuff continues to fall. the problem is this. this is the size of the casing they want to put in. it s bigger than the hole. the hole is rough. it s probably four inches bigger than this. the casing is almost the same size as the chamber we go up in. why they do that? because if we lose or dislodge a