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by throwoutway·4y ago·view on hn ↗
> though it would probably need thrusters for navigation in harbor.

Perhaps the harbor can have small tugboats that simply hook the freighters and push it into the harbor

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Some current gliders already have a propulsion system for fine adjustments that is also used for manouvering in port. I believe they would be too slow for any practical use in the merchant navy.

https://en.wikipedia.org/wiki/Underwater_glider