I would add that people would likely be interested to the drainage tunnel that the Romans excavated (emissarium) which is an incredible engineering feat, not on

I would add that people would likely be interested to the drainage tunnel that the Romans excavated (emissarium) which is an incredible engineering feat, not only because it has an exceptionally accurate (low, 0,8/1% gradient) slope, but because it was excavated from both sides of the mountain and at the connection there was an error of only a few meters. I don't seem to be able to find a dedicated article/site, there is a description in this .pdf: http://soci.romasotterranea.it/image/rassegna_stampa/pdf/12.pdf http://soci.romasotterranea.it/image/rassegna_stampa/pdf/12.... In 1929 the tunnel was re-used pumping in it (with mechanical pumps) the water to be able to recover the wrecks. Also interesting are reports of previous attempts to inspect the ships in the 15th, 16th and 19th century: https://penelope.uchicago.edu/~grout/encyclopaedia_romana/miscellanea/nemi/nemi.html https://penelope.uchicago.edu/~grout/encyclopaedia_romana/mi...