This tunnel beats them all.

This is like being in a really big, long mine shaft. It's really just carved right into the earth.

It was like being in a cavern or a cave.

It's too early for us to tell whether this one is connected to any previous tunnel.

We believe this tunnel is, in fact, the largest tunnel ever found on the south-west border.

Whether the tunnel was used for smuggling aliens, smuggling narcotics or a worst case scenario, some sort of weapon, we don't know.

Whether they are designed to smuggle drugs, people, weapons or other contraband, these tunnels pose a threat to our nation's security.

There is no doubt that an organization like this will take whatever steps necessary to protect their interests, including taking human lives.

The tunnel is absolutely amazing. It is probably the biggest tunnel on the southern border so far.