RE: Light is time, time is light, photographs are moments - musings

I remember doing a deep dive (literally) as part of my advanced scuba course. Thirty metres from the surface, standing next to the scuttled HMAS Hobart, I looked at the red needle on my gauge and it was grey. Plenty of brightness down there, lovely day; but bandwidths of colour get absorbed by water at different rates. Red is the first to go. Because that light traveled through 30m of water before hitting the needle and bouncing back to my eyeballs, all the red was gone. I shone my torch on it, and the needle was red again (that light only traveling through 1 metre of water).
Fascinating.