Passengers had to be led off a Tube train after a Thames Water main burst and forced the closure of a station.
The Central Line was suspended between Leytonstone and Bethnal Green because of the flood in the Mile End area.
A London Underground (LU) spokesman said water had got into a ventilation shaft flooding a track.
LU said it was pressing Thames Water to resolve the problem quickly. The water firm apologised for the problems caused by the burst pipe.
Nigel Holness, LU's Operations Director, said: "The Central line is currently suspended between Bethnal Green and Leytonstone due to flooding in the Mile End area, caused by works taking place to a Thames Water main at street level.
The central line is a deep level line it rises to platform level and serves platforms 3 and 3A for Westbound services and platform 6 for Eastbound Services; it must be added that for Westbound services doors open on either side to serve either platform.
The burst water main occurred in the tunnel between Stratford and Mile End, the suspension was in place I believe until the end of traffic, with temporary service introduced between EAB (Ealing Broadway) and BEG (Bethnal Green) with another shuttle service in operation between NOA (North Acton) and WER (West Ruislip).