Why Almost Every Ship Has a Red Bottom?

Massive cargo ships and cruise liners are painted every color imaginable above the waterline. But below the ocean surface, almost all of them share the exact same deep red hull. This is not decoration. It is the result of a centuries-long engineering war against marine biology, frictional drag, corrosion, fuel loss, and catastrophic structural decay. In this video, we explore: • why ships are painted red underwater • how barnacles increase fuel consumption • the hidden physics of biofouling • the deadly chemistry of galvanic corrosion • why copper nearly destroyed iron ships • how anti-fouling coatings changed maritime engineering forever • why the red hull still survives today • the hidden safety role of the Plimsoll line What looks like a simple paint choice is actually one of the most important engineering systems in global shipping. #engineering #ships #cargo #science #howthingswork