

Where this new system overlapped the old, existing tunnels were expanded and rebuilty; however, many of the old, brick-lined tunnels were simply sealed up and otherwise left intact. Miles of the old tunnels, many of them well over 100 years old, still exist beneath the streets of the City. Several of the old pumping stations vaulted underground chambers filled with rusting, steam-powered machinery still exist as well, one of them right underneath Millennium Square.