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Would be excited to see this technology combined with the "underbelly bubbles" technology that I heard about a few years ago where they reduce drag by releasing air bubbles under the hull. Yeah it takes energy to do it but the decreased resistance is supposedly a net gain. Two 10% gains would be awesome.

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Some fleets have implemented special bottom paint to reduce drag by reducing algae growth.

I wonder how long a magnetic cleaning robot could survive on the hull of such a ship.

After manned narco subs and towed sub capsules were mitigated by new police efforts drug traffickers experimented with magnetically attached parasite containers on the side of large shipping boats. But they didn't have to move.

How do they mitigate narco subs? Sonar patrols I presume?

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