Are you forgetting the wall is being watched also? Do you think you can dig under by the time they see you and get to you?
No, actually I considered that unless every area is constantly monitored, if the footing wasn't deep enough (my point, 5' isn't) , a guy like "me" (SuperBenlamin,
that built his own 5,400 square foot house almost single-handedly and probably planted over 200 trees in his life, always digging 3 to 5' deep for fruit trees, dug trenches for water, electrical lines and footings, put up a 2000' chain link fences - with about 200 post holes - in 110+ degrees - in the middle of July - in the AZ desert, ...must I go on?
) could, in fact, take a shovel and dig under a 5' footing in a day and beat a fence suggested as sufficient with footing like that rather easily.
Point being, if I could do it so could others and that I expect/predict that this "wall" is going to have a no nonsense higher standard than that
which would allow such an easy breach. - at least, by someone
like me.