Hoffman tunnel
The Hoffman tunnel , or Hoffman drainage tunnel , was constructed to drain water from coal mines northwest of Clarysville in Allegany County , Maryland . 
<triplet> Hoffman tunnel <subj> Allegany County <obj> located in the administrative territorial entity <triplet> Clarysville <subj> Allegany County <obj> located in the administrative territorial entity <triplet> Allegany County <subj> Maryland <obj> located in the administrative territorial entity <triplet> Maryland <subj> Allegany County <obj> contains administrative territorial entity