[from
here]
The room was just sinks and storage--well, "scrub up" was self-explanatory enough. Indy opened one of the cabinets under the sinks. Without touching any of the contents (better not contaminate this stuff any more than they had to), all he could see were towels and other folded pieces of fabric. Whatever else they might be storing, it wasn't here.
Judging from the layout, though, it looked like the door to their right should be the way into the operating room. Maybe one of the doors on the far side in there would lead to something worth finding.