Input (grade 7): The Quarry Bay Congestion Relief Works involved extending the Hong Kong Island end of the Kwun Tong Line from Quarry Bay to North Point via a 4.2 â "kilometre tunnel.
Output (grade 7): The Quarry Bay Congestion Relief Works involved extending the Hong Kong Island end of the Kwun Tong Line from Quarry Bay to North Point via a 4.2 kilometre tunnel.