Here looking down a sewer. They uses these tunnels for the water supplies, and fibre optic cables. There was also a pneumatic messaging system from years ago as well.
FILE NAME: IMG_4558.jpg | DATE: 20/05/07 10:17 | CAMERA: Canon (Canon EOS 350D DIGITAL) | 35mm FOCAL LENGTH: 16mm | EXPOSURE TIME: 0.4 sec | APERTURE: F4 | ISO SETTING: 800
