Anybody know how to hang on to chipmunks from digging lower than my quad brick?

the little suckers used to dig beneath the edge of my deck after tunnel under the brick cause them to cave surrounded by. i dug down 18" and put steel plates so they could't do it. now their basically tunneling under it (i guess). i don't know what their after, theirs no nuts or anything i can see they would want. i mull over the little critters are just trying to antaganize me.

Answers:    2 option
1. Deeper/bigger wall
2. Hire local kid with paintball/airsoft/BB Gun to sit on your yard, 5 bucks and hour.
Mothballs.
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