working that case and target for a number of years, pretty much dismantling them. but unfortunately the downside of that is now you have another drug cartel that's trying to influence and move into the area. >> do you get the sense that -- there must be other tunnels being dug. do you think there are other tunnels being dug right now? >> that's actually what our tunnel task force does. the minute we find one of these things we're working on the information coming in and trying to locate the next one. before it turns into the level of sophistication we saw on this one. >> do the people that own the warehouses on the u.s. side know what's going on? or are they fooled as well? >> for the most part their absentee owners but that's one of the things we launched three days before we found this tunnel was an outreach to the otay mesa community and trying to get the business owners to provide another set of eyes and ears. >> we've visited two of these tunnels in past years, you've seen a lot. are you always surprised by just the level of sophistication? the fact they had a railway in