tunnel

function digIt()
    while turtle.detect() do
        turtle.dig()
        os.sleep(0.5)
    end
    turtle.forward()
    while turtle.detectDown() or turtle.detectUp do
        turtle.digUp()
        turtle.digDown()
    end
end

local run = 0

term.write("Tunnel Length: ")
run = read()

for i = 1, run do
    digIt()
    turtle.turnLeft()
    digIt()
    turtle.turnRight()
    turtle.turnRight()
    turtle.forward()
    digIt()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
end