Tunnel

function tunneler()
  for i=1,32 do
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.digDown()
    if i==8 then
      turtle.select(15)
      turtle.placeDown()
    end
    if i==16 then
      turtle.select(15)
      turtle.placeDown()
    end
    if i==24 then
      turtle.select(15)
      turtle.placeDown()
    end
    if i==32 then
      turtle.select(15)
      turtle.placeDown()
    end
  end

turtle.turnLeft()
turtle.dig()
turtle.forward()
turtle.digUp()
turtle.digDown()
turtle.turnLeft()

  for k=1,31 do
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.digDown()
  end

end

function turning()
  turtle.forward()
  turtle.turnRight()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.turnRight()
  turtle.digDown()
  turtle.select(16)
  turtle.placeDown()
  for k=1,14 do
    turtle.select(k)
    turtle.dropDown()
  end
end

for j=1,6 do
tunneler()
turning()
end