function gravel()
	while turtle.detect() == true do
		turtle.dig()
		os.sleep(0.5)
	end
end

function dig()
	turtle.dig()
	gravel()
	turtle.forward()
	turtle.digDown()
end

function starttunnel()
	for i=1,13 do
		dig()
	end
end

function sidetunnel()
	for i=1,5 do
		dig()
	end
		turtle.select(2)
		turtle.placeDown()
	for i=1,5 do
		dig()
	end
		turtle.turnLeft()
		turtle.turnLeft()
	for i=1,10 do
		turtle.forward()
		gravel()
	end

end

function mid()
	turtle.turnRight()
	for i=1,3 do
		dig()
	end
	turtle.turnRight()
end

function turn()
	turtle.turnLeft()
	turtle.turnLeft()
	dig()
	turtle.turnLeft()
end


starttunnel()
for i=1,20 do
	sidetunnel()
	mid()
end

turn()
for i=1,3 do
	dig()
end

	turtle.turnRight()

for i=1,20 do
	sidetunnel()
	mid()
end