It was planned to construct an intersection between the East London Line and the Jubilee Line extension at Canada Water station. As construction would require the temporary closure of the East London Line, it was decided to take this opportunity to perform long-term maintenance on the tunnel and so in 1995 the East London Line was closed to allow construction and maintenance to take place. The proposed repair method for the tunnel was to seal it against leaks by "shotcreting" it with concrete, obliterating its original appearance, causing a controversy that led to a bitter conflict between London Underground who wished to complete the work as quickly and cheaply as possible and architectural interests wishing to preserve the tunnel's appearance. The architectural interests won with the Grade II* listing of the tunnel on 24 March 1995 (the day London Underground had scheduled the start of the long-term maintenance work).