제 목    yRfAdtzQxXsIUpcQEkk 이 름    Matthew 날 짜    2018/06/29 조 회    1 I'm self-employed ab blaster He's proposing a pod in a tube solution. Ideally, you'd remove the air from the tube so the pod doesn't have to push up against it. But it's very difficult to make a vacuum tube that's 600km long.