4 ms·
London is built on clay and is easy to tunnel. NY is built on rock.
by barrkel 10y ago
London is built on clay and is easy to tunnel. NY is built on rock.
- saosebastiao 10y agoHong Kong is mostly granite, which is significantly more difficult to tunnel than the shale-like schist bedrock of manhattan...and MTR construction reflects this fact, being more expensive per km than London, Paris, or Madrid. Even after this fact, MTR construction is still 50% cheaper than the average subway construction costs in the US.