Answered by Kathy
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Aug. 07, 2015 01:45
Yes, one of the lines, Tseung Kwan O line goes under the sea via Eastern Harbour Crossing, between Yau Tong station and Quarry Bay station.
In addition, HK Station to Kowloon Station of Tung Chung Line and Admiralty Station to Tsim Sha Tsui of Tsuen Wan Line are constructed under the sea.