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The new steel beam border fence overlooks Nogales, Mexico. Since this section of new 18 foot tall fence has been completed in 2011, officials have cut the number of aliens entering the United States at this particular location drastically. However, only 685 miles of the 2,100 miles of common border between Mexico and the US have been fenced, and much of that fence is useless barbed wire or chain link. One mile of this new fencing costs from $1 million to $3 million dollars, and Arizona is using prison labor to cut down on costs. Fences will not totally deter illegal immigration - Nogales, for instance, is reputed to have more underground tunnels for smuggling people and drugs in the US than any other location along the border.