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> ...there aren't any outright technical showstoppers here

H2 molecules are extremely small -- storing them without loss is heavy and volumetrically expensive, making it implausible for any aircraft.

The same factors apply to ships, pipelines etc because space for fuel is space that does not contain high value cargo.

>The same factors apply to ships

Ships don't care about weight. The cooling infrastructure or heavy steel tanks are possible.

> Ships don't care about weight. The cooling infrastructure or heavy steel tanks are possible.

Have you looked at how high the containers are stacked on a container ship? Space taken up by fuel is space that can't be sold.

Source: we partner with commercial shipping companies and spend time not just talking to the commercial people but on the ships themselves.

The problem, just like for car, is the volume that hydrogen takes up, not the weight