User blog comment:Stormwell/Dunwall Locations/@comment-217.122.254.24-20140118164044

In front of the slaughterhouse you have all these big tanks with pipes right? well one of them goes down to the water and then turns i a sealed off area, and nearby(i believe on the same wall) it says greaves lightning oil, which is located in rudshore, which leads me to believe that through that pipe, the crude oil was pumped to greaves' factory for processing. it also makes sense when you consider that, from slaughterhouse row, you can't see any landmarks you can normally spot.