local tArgs = { ... }
if #tArgs == 1 then
	length = tArgs[1]
	deep = 0
elseif #tArgs == 2 then
	length = tArgs[1]
	deep = tArgs[2]
else
	print("Usage:")
	print("lava <length> <deep>")
	print("if deep is empty: deep = 0")
	return
end

function lava()
	turtle.select(15)
	turtle.place()
	if turtle.refuel() == false then
		--Whatever we picked up is invalid for fuel, put it back down
		turtle.place()
	end
	turtle.select(1)
end

function lavadown()
	turtle.select(15)
	turtle.placeDown()
	if turtle.refuel() == false then
		--Whatever we picked up is invalid for fuel, put it back down
		turtle.placeDown()
	end
	turtle.select(1)
end

function lavaup()
	turtle.select(15)
	turtle.placeUp()
	if turtle.refuel() == false then
		--Whatever we picked up is invalid for fuel, put it back down
		turtle.placeUp()
	end
	turtle.select(1)
end


for i=1,deep do
	while turtle.down() == false do
		turtle.digDown()
	end
end
for i=1,length do
	lava()
	lavaup()
	lavadown()
	while turtle.forward() == false do
		turtle.dig()
	end
end
lavaup()
lavadown()
for i=1,length do
	turtle.back()
end
for i=1,deep do
	turtle.up()
end