Late that night, I met Garrett again at Blackfriars Bridge, at low tide. Two of his friends joined us: Scott and Alex. Our plan was to lift a manhole cover and drop into the Victorian sewer tunnels through which flows the Fleet, one of London’s “lost rivers”. Garrett wanted to show me the Fleet Chamber, a vast Bazalgettian structure near the outfall into the Thames. We had waders and headtorches ready to go. Garrett was mildly concerned about flow levels in the Fleet, due to the day’s rain.
“We’ll get in there and have a look. If it’s running too high, we’ll just turn around and come out.”