Hamzah tunnel code

turtle.select(2)
turtle.placeDown()
turtle.select(3)
turtle.suckDown()
turtle.select(3)
turtle.refuel()
turtle.select(2)
turtle.digDown()
while true do
	function dig3x3()
		turtle.digUp()
		turtle.digDown()
		turtle.turnLeft()
		turtle.dig()
		turtle.down()
		turtle.dig()
		turtle.up()
		turtle.up()
		turtle.dig()
		turtle.down()
		turtle.turnRight()
		turtle.turnRight()
		turtle.dig()
		turtle.down()
		turtle.dig()
		turtle.up()
		turtle.up()
		turtle.dig()
		turtle.down()
		turtle.turnLeft()
		turtle.dig()
	end
	function echest()

		turtle.select(1)
		turtle.placeUp()
		turtle.select(2)
		turtle.placeDown()

		for i=4,16 do
			turtle.select(i)
			turtle.dropUp()
		end

		turtle.select(3)
		turtle.suckDown()
		turtle.select(1)
		turtle.digUp()
		turtle.select(2)
		turtle.digDown()

	end

	for n=1,19 do
		dig3x3()
		turtle.forward()
		if turtle.getFuelLevel()<80 then
		turtle.refuel()
		end
	end
	dig3x3()
	echest()
	turtle.forward()

end