One of the less obvious problems of operating a warship (or any sort of ship, really) is fouling. The marine environment is an excellent one for all sorts of organisms to grow, and many of them find the outer hull of a ship a very congenial environment indeed. This is tremendously annoying to the operators of said ships, who would rather not haul around tens or hundreds of tons of barnacles, mussels, worms, plants, algae and various other organisms. They increase fuel consumption, reduce top speed, aid corrosion, and generally make a nuisance of themselves.

HMS Formidable is careened
Because fouling has been a problem for as long as men have sailed the seas, it's not surprising that attempts to control it also date back thousands of years. So far as we can tell, none of these methods were particularly effective against fouling per se, although many of them, like fitting the ship with lead sheeting, were probably intended to control shipworms instead, and worked reasonably well for that purpose. After all, fouling merely slows you down, while shipworms actually destroy the wood of the hull. Fouling was dealt with by somehow gaining access to the ship's hull and simply scraping it off. Today, drydocks are used for this work, but in the past, ships were often careened, beached at high tide and then tilted over to give access to the lower hull. Read more...
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