Why Ships Are Painted Red Underwater 🤯

Added: 2026-05-27

[00:00:00]Why are most ships painted red underneath? Because the moment a ship enters salt water, barnacles, algae, and other marine organisms begin attaching themselves to the hull. Over time, this buildup corrods the metal, adds massive weight, and creates enough drag to dramatically increase fuel consumption.

[00:00:16]So, engineers discovered a cheaper solution. Cuprous oxide. A bright red toxic compound that continuously leeches poison into the surrounding water, killing any organism that tries to