local layers = 0

function digRow()
  turtle.digDown()
	turtle.forward()
	turtle.digDown()
	turtle.forward()
	turtle.digDown()
end

function digLayer()
  digRow()
	turtle.turnRight()
	turtle.forward()
	turtle.turnRight()
	digRow()
	turtle.turnLeft()
	turtle.forward()
	turtle.turnLeft()
	digRow()
	turtle.turnLeft()
	turtle.forward()
	turtle.forward()
	turtle.turnLeft()
	turtle.forward()
	turtle.forward()
	turtle.turlLeft()
	turtle.turnLeft()
	layers = layers + 1
end

while layers > 0 do
  digLayer()
	turtle.down()
end