Hypothetically, how would you build an international railway network undersea?

Since trains are not going to have as big a carbon footprint and is unlikely to be as catastrophic when a train develops a serious fault, plus there's no limit on how fast you can travel. I assume MAGLEV would be the technology to use. How would you achieve this/how do you think it's possible to achieve... show more Since trains are not going to have as big a carbon footprint and is unlikely to be as catastrophic when a train develops a serious fault, plus there's no limit on how fast you can travel.

I assume MAGLEV would be the technology to use.

How would you achieve this/how do you think it's possible to achieve this and what innovations need to come before it can be achieved?

How could you get from London to Sydney in the time it currently takes to get from London to Edinburgh?
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