Hampstead is the deepest London Underground station, with its platforms about 58.5 metres below ground.
The station is on the Northern line's Edgware branch and opened in 1907 as part of the Charing Cross, Euston and Hampstead Railway. Its depth reflects the deep-level construction used for many early electric Underground routes. Engineers bored tunnels beneath the streets rather than excavating large open trenches.
Hampstead's platforms are reached by lifts rather than a conventional long staircase. The station is also notable for its position beneath Hampstead, one of London's hilliest built-up districts. The surrounding high ground helped make a deep station practical while keeping the railway aligned with the route.
Depth records can be reported differently depending on whether a source measures the platforms, track, or station entrance. Hampstead is the standard answer for the deepest Underground station by platform depth. It should not be confused with the deepest point on the entire railway network.