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Mazel felt that what I had seen had both red fluorescence properties as well as red full-spectrum reflectance color.

The flash revealed the full-spectrum reflectance, which in that case was just brown. He explained that what Luis Marden had probably witnessed was daylight-stimulated red fluorescence. We generally don't see fluorescence because it's not strong enough. He explained that underwater we see color because of the differential absorption and reflection of broadband white light - both sunlight and flashlight - from a surface. Mazel said it was right to rule out bioluminescence, but not necessarily fluorescence. Charles Mazel, who studies optical properties of marine organisms, especially corals, and also has a business called NightSea. I then had an interesting email exchange with a true expert on the matter, Dr. I also had my doubts about fluorescence as the red was still red in the flash picture.Ī bit more research brought me to a National Geographic source where Luis Marden explained that fluorescent red would disappear in the flashlight. I felt that bioluminescence should be ruled out since it was daylight when I saw the phenomenon. Suggestions were that I had come across and example of either bioluminescence or fluorescence. I consulted with several experts on this strange occurence and also solicited opinions on. Below you can see what caught my attention: The camera saw things exactly as my naked eye had seen it. I took a picture of the phenomenon with my Canon G10 digital camera, first without flash, then with flash. Not just reddish or reddish-brown, but deep, solid red. In the midst of all that blueish-green I saw bright, solid red. The first time I saw it was in Roatan while diving at about 60 feet on a bright, sunny day with great visibility. On this page I compiled a number of pictures of red at depth. What this means is that if you're diving at 60 feet or so, you see mostly blues and greens. In murky water there is less light penetration and things tend to look greenish-yellow. Green stays longer and blue the longest, which is why things look bluer the deeper you go. Orange disappears next, at around 50 feet.

Lower energy waves are absorbed first, so red disappears first, at about 20 feet. Underwater, waves travel differently, and some wavelengths are filtered out by water sooner than others. Colors are really nothing more than different wavelengths reflected by an object. Red at depth Colors disappear underwater, but not alwaysĬolors are different underwater.