At each end, the tunnels are connected to surface buildings by four escalators and lifts. The Waygood-Otis escalators have 306 wooden steps each, and are the original models from 1951. At the time of construction, they were the longest single-rise escalators in the world, with a vertical rise of 85ft (25.9m) and a length of approximately 200 ft (60 m).
The entrance of the north tunnel is now built on top of the house that Robert Stephenson was born in.
Starting at the south side these photos are in order of the walkthrough.
A 5 minute video of a walk through the tunnel
A video shot on a bike going through the tunnel
In pictures: Building the first Tyne Tunnel