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Less efficient, but when the energy is used, the weight is gone. And that turns out to be important for efficiency.

What I'm curious about his how long will they last in that harsh salty environment?

Sure, aircraft work with this a lot (some can't even safely land with full fuel load) but I wonder how important this is for boats ?

Also for boats you need to account for shifting center of mass as the fuel gets used up, which is not an issue with batteries.

I don't understand this thinking at all. Hydrogen itself doesn't weigh much but the containment does. The actual change in mass due to hydrogen being used up should be <1% of the ship mass. This is entirely unlike aircraft.

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