Mine v2

--  ____ ____ _  _ ____ _  _ ____ ____ ____ ____
--  [__  |___ |  | |___ |\ | [__  |___ |__| [__   ____ ____ ____ ___    ____ __ _ ___    ____ ____
--  ___] |___  \/  |___ | \| ___] |___ |  | ___]  |___ [__] |--< |--'   |--| | \| |__>   |___ [__]
--
-- TURTLE WILL CREATE A 3X3 'TUNNEL' AND MUST BE PLACED ON THE GROUND


-- // VARIABLES //
interval = 100 -- This is user defined!
emptyInventory = 0
state = 0 -- 0 low; 1 mid-up; 2 top; 3 mid-down

-- // FUNCTIONS //
function turtleEmptyInventory()
        if emptyInventory == 1 then
                for i=1,16 do
                        turtle.select(i)
                        turtle.dropDown(64)
                end
        elseif emptyInventory == 0 then
                print("I can't do it!")
                shell.run(startup)
        end
end

function turtleTurnAround()
        turtle.turnRight()
        turtle.turnRight()
end

function turtleReturn()
        if (state == 1 or state == 4) then
                turtle.down()
        elseif (state == 2 or state == 3) then
                turtle.down()
                turtle.down()
        else
                print("turtleReturn")
        end
        for i=1, interval do
                turtle.forward()
        end
                turtleTurnAround()
                print("Emptying Inventory!")
                turtleEmptyInventory()
                os.shutdown()
end

function turtleDigRow()
        turtle.turnLeft()
        for i=0,2 do
                while turtle.detect() do
                        turtle.select(1)
                        turtle.dig()
                        sleep(.13)
                        if (turtle.getItemCount(16) > 0) then
                                print("I have reached maximum capacity!")
                        if (i==0) then
                                turtle.turnLeft()
                        elseif (i==1) then
                                turtleTurnAround()
                        elseif (i==2) then
                                turtle.turnRight()
                        else print("turtleDigRow Item Check")
                        end
                turtleReturn()
                        end
                end
        if (i<2) then
                turtle.turnRight()
        elseif (i==2) then
                turtle.turnLeft()
        else
                print("turtleDigRow")
        end
        end
end

function turtleThreeByThree()
        for i=0,2 do
                turtleDigRow()
                if (state == 0 or state == 1) then
                        turtle.up()
                        state = state + 1
                        elseif (state == 2) then
                                turtle.forward()
                                state = 3
                        elseif (state == 3 or state == 4) then
                                turtle.digDown()
                                turtle.down()
                                state = state + 1
                        elseif (state == 5) then
                                turtle.forward()
                                state = 0
                end
        end
end

-- // MAIN SCRIPT // --
for i=1, interval do
        turtleThreeByThree()
end
        turtleTurnAround()
        turtleReturn()