Figuring Out What It Was
Thanks to the YouTube users, he found out that it was probably a cistern. If you are not familiar with the term, it was basically a tank that held water. It must have been in use when the building was still an industrial factory! Cisterns were typically used before the invention of indoor plumbing. The cistern collected rainwater and stored it so that the residents could use it at a later time. There were markings on the walls thanks to the rising and falling of the water levels. But why was it hidden like that?

Figuring Out What It Was
No Longer Necessary
Even though he could work on restoring the cistern to normal use, it was basically useless. With the developments of modern technology, there was no need for it. A lot of people said that cisterns were common in older industrial buildings. Most owners just sealed them off! Cyrex686 was relieved to see that the pipes were not full of liquid sewage or anything dangerous and disgusting. It was also a good thing that the cistern had been sealed since it could have led to a flood of dirty rainwater.

No Longer Necessary