It would have to be sealed to create a pressure difference

, which makes me also wonder how they plan to pull into the stations without hoovering up the paying customers.
He's just proposed a way so that the entire tube wouldn't have to be pressurised, just a few feet in front of the hypertrain.
It's entirely faesable n all it'll just cost shitloads with no idea any of the quoted figured will be accurate. The 1st time I seen the idea it was a futuristic project that crosses the atlantic under water, the sealed chamber provides buoyancy then being tethered to the ground. The idea is also toyed with in futurama n all, they travel everywhere by those tubes and you'd have to think that underground networks are already constructed for this.
Fantastic vision, I'd love to see it but like the space elevator I don't think the tech is quite there just yet or there's so many things we need to think about before getting the idea for a prototype right.
[color=red] . : [/color][size=85] You knows you knows [/size]