I want to know the answer to the following question:
What is the main material used to build the cellar in the basement of Main Building?
All the background I'm provided with is that "The entire vaulted brick structure of the cellar was encased in steel and concrete and relocated nine feet to the west and nearly 19 feet (5.8 m) deeper in 1949, when construction was resumed at the site after World War II.". Is that enough to answer the question?
Answer: yes