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:
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 . 33 miners have been trapped for 35 days , 2,300 feet under the earth .