The crypt portion of the church, constructed from 1908 to 1915, was the only segment of the church that was fully completed. It was built partially below ground, due to being on a hillside, and it was designed so that it would feel like it belonged in the surrounding nature.
The crypt section of the church, which was built between 1908 and 1915, is the only part of the church that was completed.  It was constructed partly below ground due to its location on a hillside and designed to appear as if it belonged in nature.