tunnel2

local x=0
local y=0
if #arg == 2 then
	x=tonumber(arg[1])
	y=tonumber(arg[2])
else
	return
end
for j=1,y do
	for i=1,x do
		turtle.dig()
		turtle.forward()
		turtle.digUp()
	end
	if j<y then
		if j%2==1 then
			turtle.turnRight()
		else
			turtle.turnLeft()
		end
		for k=1,3 do
			turtle.dig()
			turtle.forward()
			turtle.digUp()
		end
		if j%2==1 then
			turtle.turnRight()
		else
			turtle.turnLeft()
		end
	end
end