What Happens If SHIPS Didn't Have Red Paint Below the Waterline?

Added: 2026-05-06

[00:00:00]Without anti-fouling paint, ships would face something called biofouling, and it would start almost immediately.

[00:00:07]Within just a few weeks of a ship being in the water, barnacles and algae would begin attaching to the hull. Within a few months, the bottom of the ship would look like an underwater reef. We're talking hundreds of kilograms, sometimes even tons, of marine growth clinging to the hull. Now, here's where it gets really serious. All that extra weight and roughness on the hull creates something called drag. Imagine trying to run through water versus running through air.

[00:00:43]The rougher and heavier the bottom of the ship, the harder the engine has to work just to move forward. Studies have shown that heavy biofouling can increase a ship's fuel consumption by up to 40%.

[00:00:55]That's not a small number. For a large cargo ship that burns hundreds of tons of fuel per day, that's a catastrophic increase in cost and pollution. So, no red paint doesn't just mean a dirty ship. It means a slower, hungrier, much more expensive ship.