[quote]They say the 800m (874 yards) tunnel was used to transport an "unprecedented cache" of cocaine and marijuana. It was the 13th sophisticated secret tunnel found along California's border with Mexico since 2006. But a local official described it as "ingenious" and unlike anything seen before. Three have been found on the same short street in San Diego that runs parallel to a border fence with Mexico. In the latest incident about 1,016kg (2,242lb) of cocaine and 6,350kg of marijuana suspected of being transported through the tunnel was seized, officials say.[/quote] Last I checked, shovels still exist, so a wall wouldn't have kept this out.