Why are ships painted red below the waterline? (in 1 min)
Why Ships Are Painted Red Underwater (The Real Reason)
Have you ever wondered why almost every large ship is painted red below the waterline?
In this 1-minute explainer, we uncover the real reason behind this iconic design. It’s not about looks—it’s about protection. Ships constantly face a problem called biofouling, where algae, barnacles, and other marine life stick to the hull, slowing the ship down and increasing fuel consumption.
To solve this, shipbuilders use special antifouling paints containing copper-based compounds, which naturally give the hull its red color while preventing marine growth.
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