Which station platforms are the deepest on the London Underground network?

Hampstead is a London Underground station in Hampstead, North London. The station is on the Edgware branch of the Northern line, between Golders Green and Belsize Park stations, and is the northernmost subterranean station on the branch. The station is on the boundary between Travelcard Zone 2 and Zone 3.

Designed by architect Leslie Green the station was opened on 22 June 1907 by the Charing Cross, Euston & Hampstead Railway. Located at the junction of Heath Street and Hampstead High Street, the name Heath Street was proposed for the station before opening: indeed, the original tiled station signs on the platform walls still read Heath Street. Hampstead is on a steep hill and the station platforms are the deepest on the London Underground network, at 58.5 metres (192 ft) below ground level. It has the deepest lift shaft on the Underground at 55 metres (180 ft) which houses high-speed lifts. They were previously Otis lifts, but were modernised by Wadsworth lifts, & again in 2014 by small generic lift installer Accord. There is also a spiral emergency staircase of over 320 steps.