My thought, would be (if I'm not totally derping and missing something, and I have no idea if this would work or not, but worth a shot, right?) is if you are using a chicken chunks chunkloader, make another one, and click show lazerz, if my idea is correct, then it will show the lazerz of the chunkloader on your tunnel bore. Find them and whalla, dig down and find your tunnel bore.
gusgillis1 is not responsible for not finding your tunnel bore because this does not work, and falling into lava because you dug strait down like an idiot. :3
gusgillis1 is not responsible for not finding your tunnel bore because this does not work, and falling into lava because you dug strait down like an idiot. :3