Quarry Bay
The Quarry Bay Congestion Relief Works extended the Hong Kong Island end of the Kwun Tong line from Quarry Bay to North Point via a pair of tunnels. The project was initiated due to overcrowding at Quarry Bay and persistent passenger complaints about the five-minute walk from the Island line platforms to the Kwun Tong line platform. Construction began in September 1997 and was completed in September 2001 at a cost of HK$3.1 billion. As with most earlier interchange stations, a cross-platform interchange arrangement was provided here in both directions.