function TUNNEL()
	turtle.dig()
	os.sleep(0.5)
	while turtle.detect()==true do
		turtle.dig()
		os.sleep(0.5)
	end
	turtle.forward()
	turtle.digUp()
	turtle.digDown()
	os.sleep(0.5)
	while turtle.detectUp()==true do
		turtle.digUp()
		os.sleep(0.5)
	end
end

w=turtle.getItemCount(16)
for j=1,w do
	for i=1,2 do
		TUNNEL()
	end
	turtle.back()
	turtle.select(16)
	turtle.placeUp()
	turtle.forward()
	turtle.turnRight()
	for i=1,5 do
		TUNNEL()
	end
	turtle.turnLeft()
	turtle.turnLeft()
	for i=1,5 do
		turtle.forward()
	end
	for i=1,5 do
		TUNNEL()
	end
	turtle.turnLeft()
	turtle.turnLeft()
	for i=1,5 do
		turtle.forward()
	end
	turtle.turnLeft()
end

turtle.turnLeft()
turtle.turnLeft()
for i=1,w*3 do
	turtle.forward()
end