The Mystery Unveiled
Closer inspection would reveal that the hidden room was actually a part of the Underground Railroad used by African-American slaves back in the 19th century. The network was used to free them from slavery and took them to the free states and even Canada. It was important that the network had a house close to the border so that it would be easy to cross the border.
Code Words
The network was called the “Underground Railroad” so that no outsider would learn about it. Aside from the name itself, there were many codes used to ensure their security. They called the escaped slaves “passengers” and the members “agents.” The room discovered by the Reddit user was called a “station” as this served as a waiting spot for agents. The person who owned such a house was called the “station master”. Lastly, the people who led the passengers to safety were called “conductors”.