Nemi Temple of Diana

This old photo of the baths/pools is on the placard inside the Naval Museum by the lake. If you compare the site plan and the photo, it looks like this was a water-oriented structure ancillary to the buried theatre and possibly connected to it by a duct. It has also been re-buried. I believe the text translates "The thermal plumbing/installation/plant. Excavated in 1924" Considering how flat the surface of this area is now, this feature looks like it's a good 1.5-2m beneath the surface or more.