The Hampstead Tube Station opened in 1907 for the Charing Cross, Euston & Hampstead Railway. It was originally intended to be known as Heath Street Tube Station. The platforms of this station, at 58.5 m (192 ft) below ground level, is the deepest in the London Underground network. There is a spiral emergency staircase from the platform to the top, comprising 320 steps.
Hampstead Station (GPS: 51.55666, -0.17827) Source: https://commons.wikimedia.org/wiki/File:Hampstead_station_building.JPG Author: Sunil060902
Platform level at Hampstead Station (GPS: 51.55666, -0.17827) Source: https://commons.wikimedia.org/wiki/File:Hampstead_station_southbound_look_north.JPG Author: Sunil060902