Tunnels
We’ve put up a gigantic fence, so now criminals and immigrants are digging tunnels along the US border instead, and the pace is picking up: 60% of all the tunnels every found by border patrol agents have been discovered in the last three years. Agents spot a new one every month.
While most tunnels are used to move drugs or people, they could also be used to move in weapons and explosives for a terrorist attack. Tunnels are a serious challenge for border patrol agents because they can begin and end almost anywhere; their entrances and exits are often hidden inside old warehouses or under trees; if old ones are discovered, new ones are quickly begun.
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