Why do ships have the bottom half of their hull painted red?

Question

Why do ships have the bottom half of their hull painted red?

In: 4566

Answer 1

I watched a Youtube video on this recently: [https://youtu.be/-AdW030xQB4](https://youtu.be/-AdW030xQB4)

Good channel if you want simple, non-technical explanations to various nautical phenomena.