Originally built as a reservoir to feed the citrus groves of San Bernardino through a series of flumes and tunnels, this engineering marvel eventually fell apart. For legal reasons, the project never worked and the reservoir became a recreational area. What most people don't know is that there is a whole world under the lake. Huell takes a hundred-foot ride down in an elevator that was built in the late 1800s to explore this underwater marvel. Believe it or not there is a 3,000 foot tunnel that runs under the lake and lots of wonderful old equipment, including pumps, engines and valves originally built for irrigation purposes.