#shaft.passage  a vertical passage into a mine
  supertype:  #passage.way  a way through or along which someone or something may pass
  part of:  #mine
  subtype:  #air_shaft__airshaft__air_well__airwell  a shaft for ventilation
  subtype:  #downcast  a ventilation shaft through which air enters a mine

No statement uses or specializes #shaft.passage; click here to add one.