AnimeshChemical Storage Theory
Following all the speculation cryrex686 decided to post his own theory on the matter. Since he was the one who was actually inside the room and got to walk around the place, even inspect it as evident from the video. It would be fair to trust his judgment on the matter. He wrote, “I think it was for liquid chemical storage. There are hookups on the outside next to the rail spur line used to supply the factory that was here before.”