Access hatch for a portion of the Hetch Hetchy water tunnel, alongside the Vasona industrial lead, Cupertino, California.

Shot with the Nikon D70s and the 18-70mm f/3.5-4.5 zoom at 38mm, ISO 400, f/7.1, shutter 1/800 sec. Exposure, contrast, levels, and highlights adjustments in Aperture.