London Underground modernisation: the next four lines
The Tower Subway is a tunnel beneath the River Thames in central London, between Tower Hill on the north side of the river and Vine Lane on the south. In 1869 a 1,340-foot circular tunnel was dug through the London clay using a cast iron shield, an idea that had been patented in 1864 by Peter W. Barlow but never built.
Explore contextually related video stories in a new eye-catching way. Try Combster now!