Weight room -- hey Joe -- your floor plan and last games description don't match. Where is the main floor enterance in relation to the weight room?
Yeah, it was a kind of "off the top of my head" sort of thing when I was narrating it. But I found a floor plan a few days later that works perfectly for the facility, so let's just consider it a bit of a retcon. They headed in the front door, and heard the noise from the Strength Training Area (21 on the map).