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Report - - Tower Subway, London - Oct 2015 | Underground Sites | 28DaysLater.co.uk

Report - Tower Subway, London - Oct 2015

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angelica

28DL Full Member
28DL Full Member
History bit

The Tower Subway was the second tunnel constructed under the Thames and is located slightly west of Tower Bridge itself. As tunnels go, it's quite humble given that it pioneered the construction method which provided a foundation for future underground railways.

Unlike Brunel’s shield tunnelling method for the Thames Tunnel, which used a rectangular shield and brick lining, the Tower Subway was constructed with a new method invented by P. W. Barlow in 1862. He realised that it was possible to drive cast-iron cylinders and segments through the London clay with a new method of grouting (injecting mortar into the gaps left between the shield and segments) enabling a more practical method of tunnelling under London.

Construction began in 1869 overseen by J. H. Greathead, a man better known for his involvement on the City and South London Railway: London's (and the world’s) first underground electric railway.

Greathead was inspired by Barlow’s tunnelling method to develop his later tube construction; perhaps more interestingly he also applied his creative genius to improvements in roller skates - which is quite apt considering the rogue skateboard which we found halfway through the tunnel.

The subway opened in 1870, originally as a steam powered cable railway, but was removed only after a few months as it was both uneconomical and unreliable. A pedestrian footpath replaced it but people rarely used the toll subway once Tower Bridge opened in 1894. The subway was closed in 1898.

It is now used apparently for water and utilities.

Visit bit

Visited with Maniac, SirJonnyP, T. and M.(not sure of his username)

On reaching the bottom of the shaft the view is similar the whole way through the tunnel. Huge rusting pipes run down each side leaving a narrow but not claustrophobic walkway. The tunnel construction changes from concrete, to iron segments, to pretty brickwork, though this is barely perceptible unless you’re looking for it. In places the ground is just dirt (who knows where this came from) but some brown tiles remain intact nearer the north end.

The best bit of this subway, which I’m sure the original passengers didn’t get to enjoy, was the Crystal Maze-esque monkeying on the pipes to avoid a section of foot-deep water. Disturbing the water causes a huge noisy pump to switch on, which is also a bit of a bitch to navigate around.

Apparently the subway is at least 30ft deeper than the river, but this doesn’t stop loads of stalactites forming which I found fascinating.

The climb back up isn't too strenuous but a bit rusty in place. Watch your step!

Anyway onto the images - taken from my new camera’s first outing (so excuse the quality).

a) Beginning of the flooded section - the fun begins!
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b) Stalactites forming through iron segments
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c) Slightly rustier section looking south. The pipes to the left are covered with some sticky kind of tar covered fabric.
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d) Here the floor is covered with brown tiles, not sure if they are original.
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e) This bit partially shows the difference in height within the tunnel (perhaps when it was fixed during the war). I chose to focus on the light fitting
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f) Segments up close - the holes in the middle are possibly where the grouting was injected to close up the void left by the tunnelling shield
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g) Tiny stalactites
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g) North brick lined shaft
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h) Same shaft looking up
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Quite an unassuming tunnel, but amazing to think it's sat safely under the Thames for over a century.
 
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