Mole repelling 101

Here's the plan. I dig a ditch all around the garden, fill it with gravel, and voila! No moles can get in. We trap the ones that are enclosed within the perimeter, and Bam! no more moles in the garden. Sounds pretty easy, right? Well, take a closer look at the monster I created for myself.

I've dug about 20" so far. I have to go all the way around there, 

all the way around there,

and back around to my little pathetic start. Sigh. You can see Joe was having fun while I dug.

These are my trusty tools.

I like them, Yah?

I put a mark on the shovel to get an easy reference to how deep I am . Much faster than a tape measure or a stick.

I will defeat the mole! muwahahahaha!  We will have an awesome vegetable garden this year!

I just have to keep digging. And digging, and digging...Anybody want to help?