3tunnel.lua

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