3 ms·
Underground isn't an infinite space. Power, Sewers, basements, vaults, foundations, and existing tunnels. In London, building a new tunnel for crossrail involv
by isostatic 7y ago
Underground isn't an infinite space. Power, Sewers, basements, vaults, foundations, and existing tunnels.
In London, building a new tunnel for crossrail involved threading a TBM through a gap with 80cm clearance (that's less than 2 cubits).
The deeper you go, the wider the problems above, the more existing infrastrucutre is effected, not to mention the issues of how to return to the surface.
Build decking over all the existing surface streets, only allow electric vehicles on the (current) underground streets, don't allow anything larger than a pushbike on the top.
- jakecopp 7y agoAre there any examples of this "decking" model that have worked? What about all the businesses that occupied the old ground floor? This multi layered fantasy seems to have been around since GM's world fair exhibit in 1939 at least [1], but I haven't seen it work. [1]: https://en.wikipedia.org/wiki/Futurama_(New_York_World%27s_Fair) https://en.wikipedia.org/wiki/Futurama_(New_York_World%27s_F...
- isostatic 7y agohttps://en.wikipedia.org/wiki/Seattle_Underground https://en.wikipedia.org/wiki/Seattle_Underground