>>1831715>It will house roughly 5 million people and will include a high-speed train under the buildings to let people move about in it.Instant fail. Underground subway is for cases of existing cities, when you have no other option it dig under existing buildings. If you build infrastructure f on the clean sheet you can build anything you want and suspended train/monorail is much better option.
Why? Because been underground is gloomy and depressing. Riding in the open seeing sun and enjoy the viiews is mood risin. Thus monorail>subway. FACT.