function dig()
  	turtle.dig()
  	turtle.digDown()
	turtle.digUp()
	while turtle.detectUp() do
     	turtle.digUp()
		os.sleep(1)
	end
	while turtle.detect() do
		turtle.dig()
		os.sleep(1)
	end
end

l=0
e=2

while true do

  for h=1,2 do

    for k=0,l do
      dig()
      turtle.forward()
    end

    turtle.turnLeft()
	dig()
    turtle.forward()
  end

  l=l+1
	if turtle.getItemCount(15)>0 then
    	turtle.digDown()
    	turtle.select(1)
    	turtle.placeDown()
    	for h=1,15 do
    	    turtle.select(h+1)
    	    turtle.dropDown()
    	end
    	turtle.select(1)
		turtle.digDown()
	end

end