OK, Grant. Here you go. It originated as a drug smuggling tunnel. However, I have seen in recent years that it was used to smuggle in undocumented immigrants, some from the middle east.
.S.-Canadian drug smuggling tunnel[edit]
In early 2005, a group of Canadian drug-smugglers took up the idea, and constructed a tunnel between a greenhouse in Langley, British Columbia and the basement of a house in Lynden, Washington, which lay across the ditch marking the United States-Canada border (the house on the Langley side was on 0 Avenue ("Zero Avenue"), which runs parallel to the border and is the baseline of Langley's avenue-numbering system). They bought the two properties and began construction work. Authorities were alerted when a neighbor noticed the large-scale construction work being undertaken in the greenhouse. On inspection, it was apparent that tons of construction material was entering, and piles of earth were coming out.
It became known within a short time by both American and Canadian border authorities that a tunnel was being built. Video and audio devices were installed secretly by customs officials both at the termini and in the tunnel itself.
On July 14, the tunnel having been completed, the first packs of marijuana began going through. Officials raided the home soon after and arrested the three men. They then appeared before court in Seattle.[3]
Smuggling tunnel - Wikipedia, the free encyclopedia
I really don't think it is possible to 'seal' our borders. Too many miles, and too much land mass involved. I believe our only recourse is to make it so bad for those who come here without papers that it will no longer be profitable for them to do so. But, that day is a LONG way away, IMO.