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We're not talking about an 8 foot cinderblock wall or a chain link fence here, though. We're talking high tech.
From what i've read, the fence would include an underground barrier of rods shoved down into the ground so that attmpts to tunnel under it would be virutally impossible. It would be a duel fence with 100 or so yards between them with motion and tunneling detectors. Should someone successfully surpass the first fence, the amount of time required to get over the second would allow border patrols to easily apprehend those in the zone.
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