Though the room was once used for something else in it's heyday (large rusty iron hooks protrude from the walls and ceilings, shallow troughs crisscross the room leading to the grate for drainage). Whether meatlocker or prison - you shudder to think - it is now an actively used, and reasonably clean, storage room for mundane supplies.
Aside from basic masonry and carpentry tools and supplies, you are unsure what is here more specifically, as (once away from the grate and the water beneath it) Udit can clearly hear the sounds of the men he heard earlier, conversing less than a hundred feet away, down the hall where light can be seen.
Hiding behind crates, the group can see that no door separates the two rooms; instead a fifteen foot square hallway capped by a lowered iron portcullis at the far end.