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In page Greenwich foot tunnel:
"The entrance shafts at both ends are beneath glazed domes. Lifts, installed in 1904, were upgraded in 1992 and again in 2012, and helical staircases allow pedestrians to access the sloping, tile-lined tunnel. The cast-iron tunnel is 1,215 feet (370.2 m) long, 50 feet (15.2 m) deep[2] and has an internal diameter of about 9 feet (2.74 m). The cast-iron rings are coated with concrete and surfaced with some 200,000 white glazed tiles. The northern end was damaged by bombs during the Second World War and repairs included a thick steel and concrete inner lining that reduces the diameter substantially for a short distance. The North tower has 87 steps, and the South tower has 100.
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