I'm dedicating this image to a contributor, Vilis, since he recalls seeing stagtites in the subway on his escapabes into the subway as a young boy. These were found during the survey between ring numbers 162 and 163 or 243 feet (74m) inside the subway measured from the Ferry Road side. [009] [060]

At ring number 412 being 618 feet (188.4m) we reach the lowest point of the tunnel with approx. 20 feet (6m) of clay and sand above or heads and lots and lots of muddy river Ely water, especially at Spring high tide. Now we start climbing at the slightly steeper gradient of 1:7 until we reach ring number 600 being situated 900 feet (274.3m) from the entrance. Here, on our conducted tour, we have the original paintwork still in place on the ceiling. I know its not exactly like looking up in the Sisteen Chapel but, most probably, this indicates that there was an air pocket at this point which ensured that the paint remained in place for all those years! [009] [060]