As you can see in the video the spaceship ring is slowly beginning to rise as concrete slabs are stacked together and locked into place.
Apple notes that concrete void slabs are being used to build an interlocking foundation and wall structure which "serve as both the ceiling of one floor and support for the raised surface of the floor above."
The slabs are sourced from family-owned Clark Pacific. The company apparently "developed a unique structural design to meet the demands of Apple Campus 2."
In building the new facility, Apple turned to family-owned Clark Pacific to make the void slabs that serve as both the ceiling of one floor and support for the raised surface of the floor above. Clark Pacific developed a unique structural design to meet the demands of Apple Campus 2, and the project has led to unprecedented growth and hiring for the company. It now has four plants dedicated to producing products directly related to the project. The innovation and manufacturing that went into Apple Campus 2 have also enabled Clark Pacific to expand to other large-scale construction projects up and down the West Coast.
Apple Campus 2 is scheduled for completion in late 2016. Check out the video below for more details...