Four sites, measured
Distance, not depth, decides the color
Red disappeared by 3.4 meters of water at a shallow Mediterranean site and survived past 10 meters on a clear Red Sea wreck. The depth gauge cannot explain both.
- Nearest zero
- 3.4 m
- Furthest survival
- >10 m
- Dive sites
- 4
The water between subject and lens is the path that matters
A fish one meter from the camera and a reef eight meters behind it share one frame but not one optical path. Across a measured scene spanning 6.5 to 29.7meters, the water's blue-channel effect varied by 254 times.
What the four sites showed
| Site | Water | Red measured zero |
|---|---|---|
| Michmoret | Shallow coastal green | By 3.4 m |
| Nachsholim | Green, five meters | By 4.1 m |
| Katzaa | Tropical, 10 to 15 m | At or before 6.1 m |
| Satil | Tropical, on a wreck | At or before 10.2 m |