To install the appstore app, right-click on your turtle to open the GUI, run
pastebin get iXRkjNsG appstore. To install tunnel1, run
appstore get Skeemer tunnel1.
useful to find diamonds and other stuff
Makes the turtle dig an efficient pattern where it does the boring job of digging stone while you follow behind digging only the valuable blocks. Ideal to use at y = 12 (press F3 ingame to check altitude) so it finds no lava but some diamonds :)