only the beginning !
this could go a lot further ... the hull could have a full complement of little BUGs that can crawl all over it, not only anti-fouling but also performing repairs. just like the R2 units on the spaceships in Star Wars eh ?
Could do with being a bit more streamlined though - unlike the R2s, these guys will have to deal with some pretty heavy resistance from the water if they want to work when the ships are underway