From left to right, these colors are red, orange, yellow, green, blue, and purple. Don’t believe me? Shine a light on it!
Isn’t that incredible?
This was taken at almost 40 meters to show how much color we lose at that depth. Even with great visibility, we see so little without flashlights.
For readers who are unaware, colors (wavelengths of light) are absorbed by the water (I’m oversimplifying). Without flashlights, we lose the color red very quickly. The deeper we go, the more color we lose. Eventually everything seems greenish and bluish, and eventually everything seems only bluish.
This is why so many photos online and on social media are so greenish and bluish. The colors have to be added back in with lighting, camera filters, or computer software.