Re: RE: Crossrail
"If you want to be able to tunnel without care, you need to go at least 300m deep in London ? Maybe 500m ?"
It is pretty wet down there, and that would be a problem. Also, it would be a lot of stairs to climb in the event of an emergency evacuation, equivalent to a 15 floor building with 20m - 33m high ceilings [1].
[1] Note: all tube stations in London, regardless of how deep they are, are equivalent to a 15 floor building - https://www.youtube.com/watch?v=pBTvmrRGlbE
Biting the hand that feeds IT
