Just before the Tower Shop you will see a small round building on your right. The is the entrance to a tunnel that goes under the River Thames. It was planned as a pedestrian river crossing, but is actually only used as a service tunnel for pipes.
Tunnel Entrance London Hydraulic Power Company
By Laura Porter, About.com Guide
The London Hydraulic Power Company built a tunnel under the River Thames. This is the entrance and it dates back to 1868.
Image: © Laura Porter, licensed to About.com, Inc.
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