Christians probably do not know, that Israel has a underground complex under the western wall below the Mosque.

 

1. https://www.youtube.com/watch?v=rhVh5gUWpEMhttps://www.youtube.com/watch?v=29kVDSYA4hY2.

2. https://www.youtube.com/watch?v=8IOly3-M96M 

3. https://www.youtube.com/watch?v=hmb8PGgbx8g 

There has been an under ground complex since the time of Solomon, when he built the stables under the western wall that the horses and barracks where housed.