Interest on the site: Greenwich Foot tunnel (good place to hide and use as a refugee)

A good place for hide and survive from the walkers should be undercover and also strong enough to protect the human inside. I think in this area, the Greenwich foot tunnel could be a suitable pre-built building for human to survive. It’s underneath the water (Zombies are afraid of water, they can’t swim!) and which is invisible from the outside; its inner area is very big; entrance/exit can be blocked but still have good ventilation; linking Greenwich in the south with the Isle of Dogs to the north.

The Greenwich Foot Tunnel crosses beneath the River Thames in East London, linking Greenwich (Royal Borough of Greenwich) in the south with the Isle of Dogs (London Borough of Tower Hamlets) to the north. The tunnel is currently open while refurbishment works continue on the entrance shafts and domes.

The entrance shafts at both ends lie beneath glazed domes, with lifts (installed in 1904, upgraded in 1992) and helical staircases allowing pedestrians to reach the sloping, tile-lined tunnel at the bottom. ----------- (Source from http://en.wikipedia.org/wiki/Greenwich_foot_tunnel)

This image can explain how can people get into the tunnel from the lift in the middle of the domes and also can use the spiral staircases. 

The cast-iron tunnel itself is 1,215 feet (370.2 m) long and 50 feet (15.2 m) deep^[4] and has an internal diameter of about 9 feet (2.74 m). Its cast-iron rings are lined with concrete which has been surfaced with some 200,000 white glazed tiles. The northern end was damaged by bombs during the Second World War and the repairs included a thick steel and concrete inner lining that reduces the diameter substantially for a short distance.--------(Source from http://en.wikipedia.org/wiki/Greenwich_foot_tunnel)

 

( The northern end was damaged by bombs during the Second World War and the repairs included a thick steel and concrete inner lining that reduces the diameter substantially for a short distance.)

 The Tunnel is classed as a public highway and therefore by law is kept open 24 hours a day. The tunnels are accessible by spiral staircases and large lifts 24 hours a day. The cyclists are required to dismount and push their bikes through the tunnel itself.
I've shot a short video showing how was the tunnel looks like inside:

The Greenwich foot tunnel also been used as a scene in the zombie movie <28 weeks later > where as a route for the protagonists escaped from the zombies and the bomb.