1x9 tunnel bore

function trash()
  turtle.select(1)
  turtle.placeUp()
  turtle.select(2)
  turtle.dropUp()
  turtle.digUp()
end

function up()
  for i=1,8,1 do
    turtle.digUp()
    turtle.up()
    sleep(0.5)
  end
end

function down()
  for i=1,8,1 do
    turtle.digDown()
    turtle.down()
  end
end

function cycle()
    up()
    turtle.dig()
    turtle.forward()
    sleep(.1)
    down()
    trash()
    sleep(0.001)
    turtle.dig()
    turtle.forward()
    sleep(.1)
end

turtle.dig()
turtle.forward()
while true do
  cycle()
  sleep(0.001)
end