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How about the equivalent of an space elevator turned 90°:

Can we built giant conveyer belts across the ocean?

Ships are ~5x more efficient than trains so unlikely a good trade off. It would have to be a maglev to beat shipping.

transpacific zipline (don't tell musk he might start a company)

s/start/buy

ftfy

Get rich quick scheme with the catch that you'll have to deal with Musk?

Guess I'll pass