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17122021Sengkang posted :
The tunnels between Harbourfront (NE1) and Outram (NE3) are bored tunnels (cylindrical tubes) instead of cut-and-cover (rectangular), so it makes it difficult to demolish a section of the tunnels to construct the station box for NE2. It's not like Hume (DT4) and Bukit Brown (CC18), where these two stations already had their station boxes constructed and so they can just fit in the platform screen doors and other station equipment easily while trains continue to operate normally.