MWD Tunnel
Project
I was hoping to be working on this project but instead went to
Mojave.  

There are two tunnels above the city of San Bernardino that are
approximately 5-7 miles deep.  This is a form of mining although
they aren't looking for gold or silver, but for life giving water.

Below are some links that will give more info and the pictures of
the pipe we're hauling.

http://arrowheadtunnels.com/

http://www.csem.caltech.edu/material_world/arrowhead.html
The Pictures