What It Really Is?
If you remember well, we had mentioned in the beginning that the storage room was once a part of an industrial complex. So, it was quite possible that the room was primitively used for storage. This view already had been advocated by many commenters. However, they axed the idea of using it for waste and chemicals. According to them, the storage was used as “water cistern.” It was possible that the room had stored a reservoir of water. During ancient times cisterns were used to store rainwater from the roof.