It's true! While dive watches are among the most multi-colored designs on the market, color is absorbed at depth based on the wavelength of a given color range. The longer the wavelength, the less it penetrates to deeper depths. As such, red fades around 15ft, orange around 25ft, yellow makes it to as much as 45ft, and green will be link gray by 75ft. Furthermore, these ballpark figures include horizontal travel for light underwater, so color can start to disappear very quickly.