[Boudica]

However, I noticed this video makes no mention of the expense?

Although this article Is 5 years old, It gives a pretty good cost breakdown by Elon Musk.

Interesting article. It makes a decent comparison of the costs an speed of other transportation methods like California's bullet train.

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There's also some technological concerns which may make this sort of impossible, if ridiculously difficult, to pursue. Unless Musk has more than meme power to change how research is done, I doubt we'll ever see this be publicly operational in any meaningful scale.

I'm finding myself a little confused in this respect. There's articles claiming they don't need to develop new technologies for this to happen. And then there are many criticisms saying it's technologically impossible. I'm a little lost on how these claims are so different. It's either possible to build now, or it isn't and requires significant further tech development.