street, this is one of five safe houses. before entering cameras and reinforced steel doors reveal the priority of security. >> one of the things that hits you is how modest and basic it is. small little kitchen. some of the bed rooms here are pretty dingy. marines tell us this was part of his strategy to have modest accomodation to hide in plain sight. in almost every bedroom, there's two tvs, one for security and one for tv. the picture of a normal house does transform. beneath this bathtub, a secret tunnel. if you climb down the steps, you find yourself in the tunnel itself. it's quite carefully constructed out of wood. you're quite mobile. there's an electricity system running throughout it. the nearest safe house from here