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Re:Ask HN: Do you have any ideas that seem impossible? by doingmything on Saturday July 15, 2017 @04:28PM (#14778756)
Underground tubes that deliver packages directly to your residence instantly.
Re:Ask HN: Do you have any ideas that seem impossible? by arjunvpaul on Sunday July 16, 2017 @05:09AM (#14781214)
Had the same idea :-). To revive freight tunnels. With the advancements in self driving tech and tunneling tech this would seem feasible.

Amazon could finance them and then rent capacity it out to other companies.

A pilot perhaps in Chicago by reviving the old freights tunnels - https://goo.gl/ErJQFx

The Swiss were/are considering them too - https://goo.gl/PNMRrE