There was, for example, a National Security Agency Center at the Southern Command known as the Tunnel.

Built into the side of a hill in Quarry Heights, the facility looked unassuming from the outside.

Inside was the most complete, top-secret defense and spying center imaginable.

It was used for tracking Cuba, for monitoring drug trafficking and spy planes.

During our period of cooperation on hemisphere drug interdiction in the early 1980s, drug surveillance was handled from the Tunnel.

We never told anyone of its existence.