tunnel3x3

while true do
  turtle.dig()
  turtle.forward()
  turtle.digDown()
  turtle.digUp()
  turtle.turnLeft()
  turtle.dig()
  turtle.forward()
  turtle.digUp()
  turtle.digDown()
  turtle.turnRight()
  turtle.turnRight()
  turtle.forward()
  turtle.dig()
  turtle.forward()
  turtle.digUp()
  turtle.digDown()
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
end