The tunnel was designed by civil engineer Sir Alexander Binnie for London County Council and was constructed by contractor John Cochrane & Co.
The project started in June 1899, and the tunnel was opened on 4 August 1902.
The entrance shafts at both ends lie beneath glazed domes, with lifts (installed in 1904, upgraded in 1992 and again in 2012) and helical staircases allowing pedestrians to reach the sloping, tile-lined tunnel at the bottom.
The cast-iron tunnel itself is 1,215 feet (370.2 m) long and 50 feet (15.2 m) deep and has an internal diameter of about 9 feet (2.74 m).
The tunnel remains open to this day, a unique opportunity to cross the River Thames on foot underneath the river.
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