The San Diego fence worked, as your own words prove. A fence works, it worked in East Berlin and it works in Israel and it will work here if we build it long enough. A fence that makes people travel another 700 miles to cross illegally is going to but down on crossings, if the fence is made the length of the border, and it could be, then they might dig, but digging is harder than simply driving across with a coyote and digging can be monitored easily with patrols and electonics, BUT patrols and electronics are not worth spit without the fence in place. Fence first and NEVER amnesty fence or not.
The San Diego fence worked at keeping them from crossing at San Diego, but the flow was diverted to the east county areas and Arizona.
BTW - I was responding to another poster about the need for electronic monitoring as well as the fence, so get your panties out of their wad.