Under the sea, Nasa and other light with longer wavelengths is absorbed, so white objects appear blue. The deeper the observer goes, the darker the blue becomes. In the open sea, only about one per cent of light penetrates to a depth of 200 metres. (See underwater and euphotic depth) http://httpkingsevensunglassesor92579.aioblogs.com/48162661/notas-detalladas-sobre-blue-light