Painted Boat Hulls on a Harbor Slipway

Weed and barnacles on a hull slow a boat down and cost it fuel, so working boats get hauled out every so often to be scraped and painted again. Four of them sit on a wet slipway inside the harbor wall in this fishing boat jigsaw puzzle, paint flaking and hulls still crusted from the sea. In the days of sail, navies sheathed their ships below the waterline in thin copper for the same reason. That is where copper-bottomed, meaning solid and trustworthy, comes from.