updated 06:51 pm EDT, Tue August 5, 2014
Prep work for tunnels, concrete foundation proceeding apace
New photos from KCBS traffic reporter Ron Cervi has revealed further progress on Apple's new Campus 2 structure from the last surveillance, done about three weeks ago. In the new pictures, troughs being dug that are intended for both lower levels of the facility as well as transportation tunnels are seen more clearly, with rebar work being done for the retaining walls and other substructure that will be needed for the below-ground levels of the facility.
As noted by AppleInsider, the retaining walls on the site's perimeter will likely be paired with a drainage system to prevent any flooding of the below-ground levels. Troughs are also being dug in what is likely to be the center courtyard area, though the purpose of those is not clear. Plans for the super-sized building call for a below-ground transit station that would be used for busses, along with possible underground parking for some vehicles.
The work being done now is in preparation for a massive concrete pour that will form the foundation of the main building, and initial work on the "tunnels" being created by the troughs. AppleInsider noted that the photos reveal pipes, concrete stanchions and other materials likely to be used for the building's substructure. The primary building is expected to be finished sometime in 2016, though it is not clear how many if any of the numerous supporting buildings, such as above-ground parking garages, will be complete by then.