It 's expected to arrive Thursday or Friday , an engineer overseeing the drilling said . Platform , called Plan C , will be part of operation to drill to reach the miners . Plan A drill is making progress ; Plan B drill has hit a snag . Then a larger drill could be used until the hole is wide enough so that the miners can be hoisted out , one at a time , in a small cage . Comment:
It 's expected to arrive Thursday or Friday , an engineer overseeing the drilling said . Platform , called Plan C , will be part of operation to drill to reach the miners . Plan A drill is making progress ; Plan B drill has hit a snag . Comment: