東區海底隧道
In the course of constructing Quarry Bay station, with the initial two platforms, 70,000 cubic metres of rock was excavated and 28,000 cubic metres of concrete was poured. The station opened as part of the first phase of the Island line on 31 May 1985. The station was expanded in 1989 with the addition of platforms 3 and 4, which served as the terminus of Kwun Tong line upon the opening of the Eastern Harbour Crossing.